Unable to use journalctl to diagnose why my Manjaro system just freezes

For some months my Manjaro desktop computer has had a tendency to just suddenly freeze. I find myself unable to change to my terminals (ctrl-alt-f2, ctrl-alt-f3, etc.) in order to reboot. I am left with no alternative but to turn my computer off and thence turn it on again.

Just now I attempted to use journalctl to see if the files in

/var/log/journal/751971a463ce4e0b979566f891d7c6dc/

… would show me what might have caused my computer to crash at 2:18am (UTC+11) this morning. It had also similarly crashed only 7 minutes prior to that at 2:11am. I found that journalctl was not able to give me any useful output:

[[james@vaasa 751971a463ce4e0b979566f891d7c6dc]$ journalctl --since="2021-10-27 02:17:00" --until="2021-10-27 02:19:00"
An error was encountered while opening journal file or directory /var/log/journal/751971a463ce4e0b979566f891d7c6dc/system@0005c64d13fbed9d-55ff3cc75e1a8a00.journal~, ignoring file: Input/output error
Journal file /var/log/journal/751971a463ce4e0b979566f891d7c6dc/system@ef3fd59f261b4f84b9cd3fdb6e8a66ca-0000000000000001-0005cc7f09891be2.journal corrupted, ignoring file.
An error was encountered while opening journal file or directory /var/log/journal/751971a463ce4e0b979566f891d7c6dc/user-1000@665d7ae6ed9c4297ba4c435ee62a4d55-00000000000005ab-0005cb746f52ab86.journal, ignoring file: Structure needs cleaning
Journal file /var/log/journal/751971a463ce4e0b979566f891d7c6dc/system@0005cb5ed52aadff-3c903d5217ee9bed.journal~ is truncated, ignoring file.
-- Journal begins at Sat 2021-08-14 21:40:58 AEST, ends at Wed 2021-10-27 11:14:39 AEDT. --
-- No entries --]

I am not even certain if the problem lies with my software or with my hardware.

Could anyone suggest how I could move forward from here?

Thank you for your attention.

(Update 12:38 [+11] 27/10/21:)

As I think was suggested below, I am posting the output of ‘inxi -Fazy’ below:

[james@vaasa 751971a463ce4e0b979566f891d7c6dc]$ inxi -Fazy
System:
  Kernel: 5.9.16-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.9-x86_64
  root=UUID=b06ad26f-b96a-4fca-94af-e0cbcc63001c ro quiet apparmor=1
  security=apparmor udev.log_priority=3
  Desktop: N/A wm: xfwm 4.16.1 vt: 7 dm: LightDM 1.30.0 Distro: Manjaro Linux
  base: Arch Linux
Machine:
  Type: Desktop Mobo: ASUSTeK model: PRIME H310M-K R2.0 v: Rev X.0x
  serial: <filter> UEFI-[Legacy]: American Megatrends v: 0418 date: 09/13/2018
CPU:
  Info: Quad Core model: Intel Core i3-8100 bits: 64 type: MCP arch: Kaby Lake
  note: check family: 6 model-id: 9E (158) stepping: B (11) microcode: EA
  cache: L2: 6 MiB
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 28808
  Speed: 3600 MHz min/max: 800/3600 MHz Core speeds (MHz): 1: 3600 2: 3600
  3: 3600 4: 3600
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX unsupported
  Type: l1tf mitigation: PTE Inversion
  Type: mds mitigation: Clear CPU buffers; SMT disabled
  Type: meltdown mitigation: PTI
  Type: spec_store_bypass
  mitigation: Speculative Store Bypass disabled via prctl and seccomp
  Type: spectre_v1
  mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional,
  IBRS_FW, STIBP: disabled, RSB filling
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: NVIDIA GK208B [GeForce GT 710] vendor: ASUSTeK driver: nouveau
  v: kernel bus-ID: 01:00.0 chip-ID: 10de:128b class-ID: 0300
  Device-2: Microdia Webcam Vitade AF type: USB driver: snd-usb-audio,uvcvideo
  bus-ID: 1-5:3 chip-ID: 0c45:6366 class-ID: 0102 serial: <filter>
  Display: x11 server: X.Org 1.20.13 compositor: xfwm4 v: 4.16.1 driver:
  loaded: modesetting alternate: fbdev,vesa display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2")
  s-diag: 582mm (22.9")
  Monitor-1: HDMI-1 res: 1920x1080 hz: 60 dpi: 70 size: 698x393mm (27.5x15.5")
  diag: 801mm (31.5")
  OpenGL: renderer: NV106 v: 4.3 Mesa 21.2.3 direct render: Yes
Audio:
  Device-1: Intel 200 Series PCH HD Audio vendor: ASUSTeK
  driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:a2f0
  class-ID: 0403
  Device-2: NVIDIA GK208 HDMI/DP Audio vendor: ASUSTeK driver: snd_hda_intel
  v: kernel bus-ID: 01:00.1 chip-ID: 10de:0e0f class-ID: 0403
  Device-3: Microdia Webcam Vitade AF type: USB driver: snd-usb-audio,uvcvideo
  bus-ID: 1-5:3 chip-ID: 0c45:6366 class-ID: 0102 serial: <filter>
  Sound Server-1: ALSA v: k5.9.16-1-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.19 running: no
  Sound Server-3: PulseAudio v: 15.0 running: yes
  Sound Server-4: PipeWire v: 0.3.38 running: yes
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
  vendor: ASUSTeK PRIME B450M-A driver: r8169 v: kernel port: d000
  bus-ID: 03:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:
  Local Storage: total: 894.26 GiB used: 332.47 GiB (37.2%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/sda maj-min: 8:0 vendor: Kingston model: SA400S37480G
  size: 447.13 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
  type: SSD serial: <filter> rev: B1C2 scheme: GPT
  ID-2: /dev/sdb maj-min: 8:16 vendor: Kingston model: SA400S37480G
  size: 447.13 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
  type: SSD serial: <filter> rev: 1103 scheme: GPT
Partition:
  ID-1: / raw-size: 96 GiB size: 94.24 GiB (98.17%) used: 56.77 GiB (60.2%)
  fs: ext4 dev: /dev/sda2 maj-min: 8:2
  ID-2: /home raw-size: 299.12 GiB size: 293.43 GiB (98.10%)
  used: 269.75 GiB (91.9%) fs: ext4 dev: /dev/sdb4 maj-min: 8:20
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
  ID-1: swap-1 type: partition size: 20 GiB used: 0 KiB (0.0%) priority: -2
  dev: /dev/sda5 maj-min: 8:5
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nouveau temp: 40.0 C
  Fan Speeds (RPM): N/A
Info:
  Processes: 214 Uptime: 2h 38m wakeups: 0 Memory: 15.57 GiB
  used: 3.22 GiB (20.7%) Init: systemd v: 249 tool: systemctl Compilers:
  gcc: 11.1.0 alt: 10 clang: 12.0.1 Packages: pacman: 1994 lib: 487 flatpak: 0
  Shell: Bash v: 5.1.8 running-in: xfce4-terminal inxi: 3.3.08

Tip: When pasting terminal output on Discourse forums, one can either…

  • Highlight it and use the Preformatted text </> toolbar button.

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Please edit your post accordingly. Do not use the Quote " button.

EDIT: Thank you for doing that. :+1:

Follow the directions in the post above to share the output of

inxi -Fazy

I think he means this one. :wink:

I think you will find the output of ‘inxi -Fazy’ at inxi -Fazy output on Manjaro Linux system - Pastebin.com

I will also paste it here:

[james@vaasa 751971a463ce4e0b979566f891d7c6dc]$ inxi -Fazy

(The output of 'inxi -Fazy' has been removed from this post and included in my first post above as I think was suggested to me.)

inxi output is fine to post here. Anything longer than that like logs should go to a paste service.

Also please edit your previous post instead of replying right after your previous one.

You are using an extremely outdated kernel. Incompatibility between newer software and your outdated kernel might be the cause of the freezes. You should switch to linux510, which will be supported for at least 5 years.

sudo mhwd-kernel -i linux510

Then after a reboot, run:

sudo mhwd-kernel -r linux59

Thank you, ben81. I followed your instructions. Here is the output from ‘sudo mhwd-kernel -i linux510’:

[james@vaasa 751971a463ce4e0b979566f891d7c6dc]$ sudo mhwd-kernel -i linux510;echo $?
[sudo] password for james: 
error: could not open file /var/lib/pacman/local/pcmanfm-qt-0.17.0-1/desc: Bad message
:: Synchronizing package databases...
 core                            170.9 KiB  82.5 KiB/s 00:02 [################################] 100%
 extra                          1900.2 KiB   374 KiB/s 00:05 [################################] 100%
 community                         6.8 MiB   122 KiB/s 00:57 [################################] 100%
 multilib                        175.2 KiB   145 KiB/s 00:01 [################################] 100%
resolving dependencies...
error: could not open file /var/lib/pacman/local/pcmanfm-qt-0.17.0-1/desc: Bad message
looking for conflicting packages...

Packages (2) linux510-5.10.70-1  linux510-virtualbox-host-modules-6.1.26-17

Total Download Size:   74.07 MiB
Total Installed Size:  78.45 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 linux510-5.10.70-1-x86_64        73.9 MiB   135 KiB/s 09:19 [################################] 100%
 linux510-virtualbox-host-m...   156.0 KiB   144 KiB/s 00:01 [################################] 100%
 Total (2/2)                      74.1 MiB   135 KiB/s 09:21 [################################] 100%
(2/2) checking keys in keyring                               [################################] 100%
(2/2) checking package integrity                             [################################] 100%
(2/2) loading package files                                  [################################] 100%
(2/2) checking for file conflicts                            [################################] 100%
(2/2) checking available disk space                          [################################] 100%
:: Processing package changes...
(1/2) installing linux510                                    [################################] 100%
Optional dependencies for linux510
    crda: to set the correct wireless channels of your country [installed]
(2/2) installing linux510-virtualbox-host-modules            [################################] 100%
===> You must load vboxdrv module before starting VirtualBox:
===> # modprobe vboxdrv
ldconfig: /usr/lib/libfm-qt.so is not an ELF file - it has the wrong magic bytes at the start.

ldconfig: /usr/lib/libfm-qt.so.9 is not an ELF file - it has the wrong magic bytes at the start.

ldconfig: /usr/lib/libfm-qt.so.9.0.0 is not an ELF file - it has the wrong magic bytes at the start.

ldconfig: Renaming of /etc/ld.so.cache~ to /etc/ld.so.cache failed: Structure needs cleaning
error: command failed to execute correctly
:: Running post-transaction hooks...
(1/6) Arming ConditionNeedsUpdate...
(2/6) Updating module dependencies...
(3/6) Updating linux initcpios...
==> Building image from preset: /etc/mkinitcpio.d/linux510.preset: 'default'
  -> -k /boot/vmlinuz-5.10-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.10-x86_64.img
==> Starting build: 5.10.70-1-MANJARO
  -> Running build hook: [base]
  -> Running build hook: [udev]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
loadkeys: Unable to open file: au: No such file or directory
  -> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.10-x86_64.img
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux510.preset: 'fallback'
  -> -k /boot/vmlinuz-5.10-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.10-x86_64-fallback.img -S autodetect
==> Starting build: 5.10.70-1-MANJARO
  -> Running build hook: [base]
  -> Running build hook: [udev]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [keyboard]
  -> Running build hook: [keymap]
loadkeys: Unable to open file: au: No such file or directory
  -> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.10-x86_64-fallback.img
==> Image generation successful
(4/6) Updating Kernel initcpios for Nvidia-DRM...
(5/6) Refreshing PackageKit...
(6/6) Updating Grub-Bootmenu
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-5.10-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.10-x86_64.img
Found initrd fallback image: /boot/initramfs-5.10-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.9-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.9-x86_64.img
Found initrd fallback image: /boot/initramfs-5.9-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.14-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-4.14-x86_64.img
Found initrd fallback image: /boot/initramfs-4.14-x86_64-fallback.img
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found EndeavourOS Linux (rolling) on /dev/sda1
Found memtest86+ image: /boot/memtest86+/memtest.bin
done
0

I rebooted, then ran “sudo mhwd-kernel -r linux59”

… but neglected to save the output before I rebooted again. My apologies.

Very hopefully, this will have fixed up my problem. However, when I re-booted again, I again saw another error message, which has also been troubling me for some time:

[Failed] Failed to start File System Check on Root Device.
You are in emergency mode. After logging in, type ‘journalctl -xb’ to view the system logs, ‘systemctl reboot’ to reboot, ‘systemctl default’ or ‘exit’ to boot into the default mode.

Give Root Password form maintenance.
(or press Ctrl-D to continue):

I have been in the habit of using ‘systemctl default’ to start my Manjaro system.

If this is not related to the problem I described above, then perhaps I need to make another post. If it is related to that problem, then I might need to do more to fix this problem.

Perhaps the below input from "inxi -Fazy" might indicate whether or not I have fixed that problem:

[james@vaasa julian]$ inxi -Fazy
System:
  Kernel: 5.10.70-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64
  root=UUID=b06ad26f-b96a-4fca-94af-e0cbcc63001c ro quiet apparmor=1
  security=apparmor udev.log_priority=3
  Desktop: N/A wm: xfwm 4.16.1 vt: 7 dm: LightDM 1.30.0 Distro: Manjaro Linux
  base: Arch Linux
Machine:
  Type: Desktop Mobo: ASUSTeK model: PRIME H310M-K R2.0 v: Rev X.0x
  serial: <filter> UEFI-[Legacy]: American Megatrends v: 0418 date: 09/13/2018
CPU:
  Info: Quad Core model: Intel Core i3-8100 bits: 64 type: MCP arch: Kaby Lake
  note: check family: 6 model-id: 9E (158) stepping: B (11) microcode: EA
  cache: L2: 6 MiB
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 28808
  Speed: 3600 MHz min/max: 800/3600 MHz Core speeds (MHz): 1: 3600 2: 3600
  3: 3600 4: 3600
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX unsupported
  Type: l1tf mitigation: PTE Inversion
  Type: mds mitigation: Clear CPU buffers; SMT disabled
  Type: meltdown mitigation: PTI
  Type: spec_store_bypass
  mitigation: Speculative Store Bypass disabled via prctl and seccomp
  Type: spectre_v1
  mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional,
  IBRS_FW, STIBP: disabled, RSB filling
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: NVIDIA GK208B [GeForce GT 710] vendor: ASUSTeK driver: nouveau
  v: kernel bus-ID: 01:00.0 chip-ID: 10de:128b class-ID: 0300
  Device-2: Microdia Webcam Vitade AF type: USB driver: snd-usb-audio,uvcvideo
  bus-ID: 1-5:3 chip-ID: 0c45:6366 class-ID: 0102 serial: <filter>
  Display: x11 server: X.Org 1.20.13 compositor: xfwm4 v: 4.16.1 driver:
  loaded: modesetting alternate: fbdev,vesa display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2")
  s-diag: 582mm (22.9")
  Monitor-1: HDMI-1 res: 1920x1080 hz: 60 dpi: 70 size: 698x393mm (27.5x15.5")
  diag: 801mm (31.5")
  OpenGL: renderer: NV106 v: 4.3 Mesa 21.2.3 direct render: Yes
Audio:
  Device-1: Intel 200 Series PCH HD Audio vendor: ASUSTeK
  driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 chip-ID: 8086:a2f0
  class-ID: 0403
  Device-2: NVIDIA GK208 HDMI/DP Audio vendor: ASUSTeK driver: snd_hda_intel
  v: kernel bus-ID: 01:00.1 chip-ID: 10de:0e0f class-ID: 0403
  Device-3: Microdia Webcam Vitade AF type: USB driver: snd-usb-audio,uvcvideo
  bus-ID: 1-5:3 chip-ID: 0c45:6366 class-ID: 0102 serial: <filter>
  Sound Server-1: ALSA v: k5.10.70-1-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.19 running: no
  Sound Server-3: PulseAudio v: 15.0 running: yes
  Sound Server-4: PipeWire v: 0.3.38 running: no
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
  vendor: ASUSTeK PRIME B450M-A driver: r8169 v: kernel port: d000
  bus-ID: 03:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives:
  Local Storage: total: 894.26 GiB used: 326.49 GiB (36.5%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/sda maj-min: 8:0 vendor: Kingston model: SA400S37480G
  size: 447.13 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
  type: SSD serial: <filter> rev: B1C2 scheme: GPT
  ID-2: /dev/sdb maj-min: 8:16 vendor: Kingston model: SA400S37480G
  size: 447.13 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
  type: SSD serial: <filter> rev: 1103 scheme: GPT
Partition:
  ID-1: / raw-size: 96 GiB size: 94.24 GiB (98.17%) used: 56.75 GiB (60.2%)
  fs: ext4 dev: /dev/sda2 maj-min: 8:2
  ID-2: /home raw-size: 299.12 GiB size: 293.43 GiB (98.10%)
  used: 269.74 GiB (91.9%) fs: ext4 dev: /dev/sdb4 maj-min: 8:20
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
  ID-1: swap-1 type: partition size: 20 GiB used: 0 KiB (0.0%) priority: -2
  dev: /dev/sda5 maj-min: 8:5
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nouveau temp: 42.0 C
  Fan Speeds (RPM): N/A
Info:
  Processes: 199 Uptime: 26m wakeups: 0 Memory: 15.57 GiB
  used: 2.72 GiB (17.5%) Init: systemd v: 249 tool: systemctl Compilers:
  gcc: 11.1.0 alt: 10 clang: 12.0.1 Packages: pacman: 1994 lib: 487 flatpak: 0
  Shell: Bash v: 5.1.8 running-in: xfce4-terminal inxi: 3.3.08

Thank you.

Update (18:45 +11): It’s occurred to me that with 58.58G of files in the / partition of 96G, that, perhaps having (2) swap partitions with only 20G in each is not adequate (but then again, surely even one swap partition of size 20G is adequate for 16G of RAM). I notice that there is nothing about swap files in /etc/fstab (see Appendices). I had (wrongly?) assumed that this was taken care of more or less automatically during the installation from the Manjaro Linux DVD. (The solution may be at https://askubuntu.com/questions/126018/adding-a-new-swap-file-how-to-edit-fstab-to-enable-swap-after-reboot, 4.Creating a Swap Partition, filesystem & adding it in fstab Entry - YouTube or fstab for Automatically Mounting Linux Partitions - YouTube)

My circumstances have improved, but only marginally.

In spite of the change to kernel linux510 from kernel liux59 [1], my computer still froze, but this time I was able to switch to the second terminal using Ctrl-Alt-F2 and issue the ‘sudo reboot’ command. At least this time, I did not have to turn the power off and then back on to get my computer working again.

So, my desktop computer is still unreliable. It still freezes on random occasions, including when I attempt to make posts to forums (including this forum).

Is it possible that I just have to drastically reduce the number of browser windows and tabs open? I currently need to use several browsers at once SeaMonkey, Chromium and Falkon as well as Firefox (in part this is because Firefox is so problematic - all by my Firefox folders and included links just vanished, yet again, after a recent Firefox ‘upgrade’. This is the third time in the past 6 years that this has happened to me). I would have thought that with 16G of RAM and a Quad Intel Core i3-8100 with 64bits, there would have been plenty of resources to handle browser windows, browser tabs in addition to other resource-hungry applications such as Krita, Inkscape and Openshot. However, my system is still crashing with only web browsers, Kate and a few X-terminals running and without my use of any of those more resource-hungry applications.

Maybe the fact that the home drive is 97% full is the cause? [2]

I need, one way or another, to work out how the problem can be fixed if it is a software problem. If I the problem is not related to software, I will need to find out how to fix my computer or else buy another.

Has anyone any further suggestions?

Thank you again for your attention.

Appendix 1:/etc/fstab

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=b06ad26f-b96a-4fca-94af-e0cbcc63001c /              ext4    defaults,noatime 0 1
UUID=534afd6b-5985-429d-b613-badc06eec89a /home          ext4   defaults,noatime 0 2  
tmpfs                                     /tmp           tmpfs   defaults,noatime,mode=1777 0 0

Appendix 2:/etc/mtab

proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
sys /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
dev /dev devtmpfs rw,nosuid,relatime,size=8152844k,nr_inodes=2038211,mode=755,inode64 0 0
run /run tmpfs rw,nosuid,nodev,relatime,mode=755,inode64 0 0
/dev/sda2 / ext4 rw,noatime 0 0
securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev,inode64 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
cgroup2 /sys/fs/cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot 0 0
pstore /sys/fs/pstore pstore rw,nosuid,nodev,noexec,relatime 0 0
none /sys/fs/bpf bpf rw,nosuid,nodev,noexec,relatime,mode=700 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=30,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12020 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime,pagesize=2M 0 0
debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
tracefs /sys/kernel/tracing tracefs rw,nosuid,nodev,noexec,relatime 0 0
mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,nosuid,nodev,noexec,relatime 0 0
fusectl /sys/fs/fuse/connections fusectl rw,nosuid,nodev,noexec,relatime 0 0
tmpfs /tmp tmpfs rw,noatime,inode64 0 0
/dev/sdb4 /home ext4 rw,noatime 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=1632476k,nr_inodes=408119,mode=700,uid=1000,gid=1000,inode64 0 0
gvfsd-fuse /run/user/1000/gvfs fuse.gvfsd-fuse rw,nosuid,nodev,relatime,user_id=1000,group_id=1000 0 0

Footnote[s]

[1] I would have got the initial kernel through a downloadable Manjaro Linux DVD and would have subsequently upgraded the kernel a number of times through numerous Manjaro updates, so the existing kernel on my desktop computer could not have been too much out of date.

[2] This was a consequence of my unsuccessful attempt to load MP4 and JPG files from my Panasonic Lumix Video camera. After the /home partition became 100% full, I reduced that figure to 97% by deleting a number of .iso files.

I seem to have finally fixed my problem just by adding:

UUID=4e6e264c-4ec8-4378-b6f3-5ca6b8d727ee none swap defaults 0 0

… to /etc/fstab. The full /etc/fstab is:

# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=4e6e264c-4ec8-4378-b6f3-5ca6b8d727ee none           swap    defaults 0 0
UUID=b06ad26f-b96a-4fca-94af-e0cbcc63001c /              ext4    defaults,noatime 0 1
UUID=534afd6b-5985-429d-b613-badc06eec89a /home          ext4    defaults,noatime 0 2  
tmpfs                                     /tmp           tmpfs   defaults,noatime,mode=1777 0 0

My apologies for my having barked up the wrong tree for so long. Hopefully, I will finally (after 2 years) have my desktop Linux computer perform as it should.

Should you not hear from me again on this forum, you will know that my problem is fixed.

Thank you again for all of your attention and for all of your efforts to try to help me.