Manjaro won't boot after update, Nvidia problems

you have also bbswitch, so remove it too:

sudo pacman --sysroot /mnt -R linux519-bbswitch linux519-rt-bbswitch linux519-rt linux519 linux519-nvidia-390xx linux519-rt-nvidia-390xx

rerun update again:

Still no luck:

error: target not found: linux519-rt-bbswitch

so you have installed linux519-rt but not the bbswitch with it, interestingā€¦ so run the command without it:

sudo pacman --sysroot /mnt -R linux519-bbswitch linux519-rt linux519 linux519-nvidia-390xx linux519-rt-nvidia-390xx

Here are the results:

:: Do you want to remove these packages? [Y/n] Y
:: Running pre-transaction hooks...
(1/1) Removing linux initcpios...
:: Processing package changes...
(1/5) removing linux519-rt-nvidia-390xx                 [#############################] 100%
(2/5) removing linux519-nvidia-390xx                    [#############################] 100%
(3/5) removing linux519-rt                              [#############################] 100%
(4/5) removing linux519-bbswitch                        [#############################] 100%
(5/5) removing linux519                                 [#############################] 100%
:: Running post-transaction hooks...
(1/3) Arming ConditionNeedsUpdate...
(2/3) Updating module dependencies...
(3/3) Updating Grub-Bootmenu
Generating grub configuration file ...
Found theme: /usr/share/grub/themes/manjaro/theme.txt
Found linux image: /boot/vmlinuz-6.0-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-6.0-x86_64.img
Found initrd fallback image: /boot/initramfs-6.0-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.15-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.15-x86_64.img
Found initrd fallback image: /boot/initramfs-5.15-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.15-rt-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.15-rt-x86_64.img
Found initrd fallback image: /boot/initramfs-5.15-rt-x86_64-fallback.img
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-5.4-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.4-x86_64.img
Found initrd fallback image: /boot/initramfs-5.4-x86_64-fallback.img
Found linux image: /boot/vmlinuz-4.19-x86_64
Found initrd image: /boot/intel-ucode.img /boot/initramfs-4.19-x86_64.img
Found initrd fallback image: /boot/initramfs-4.19-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.
ERROR: mkdir /var/lock/dmraid
grub-probe: error: cannot find a GRUB drive for /dev/sdb1.  Check your device.map.
grub-probe: error: cannot find a GRUB drive for /dev/sdb1.  Check your device.map.
Found memtest86+ image: /boot/memtest86+/memtest.bin
done

and why do you have installed all kernels, thats not neededā€¦

Was my mistake, Iā€™m largely new to Manjaro. Last time I had Linux exposure before the prior year was Linux Mint back in 2012, and Ubuntu before then. Iā€™ve also rarely been on my PC much in the past 7 years because of my job as a truck driver, so havenā€™t had much time to learn and re-learn stuff.

thats okā€¦ just rerun the update

Running now, fingers crossedā€¦

Looks like it worked. It said the kernel was updated, as well as over 600 over items from the looks of it. Iā€™m assuming I now close out the terminal and reboot the laptop?
Hereā€™s one of the last messages, since thereā€™s too much to copy/paste:

==> Warning:
	 -> Kernel has been updated. Modules of the current kernel
	 -> have been backed up so you can continue to use your
	 -> computer. However, the new kernel will only work
	 -> at next boot.

@brahma , it worked! Manjaro re-booted successfully! Thanks so much!

good, now remove these kernels, you dont need all of them:

sudo mhwd-kernel -r linux515-rt
sudo mhwd-kernel -r linux510
sudo mhwd-kernel -r linux54
sudo mhwd-kernel -r linux419

If you want to keep a bootable system, see:

And keep an eye on the #announcements:stable-updates section, there are announcements when updating, along with a list of possible gotchas.