Help! My system is not updating. I ran
sudo pacman -Syyu after the GUI update failed.
I got to Making BTRFS snapshot and got this error:
Root filesystem is not btrfs! exiting…
Errors occurred, no packages were upgraded.
I recently changed my Snapshot partion on a USB external hard drive to btrfs and even created a snapshot on it with no problems.
My root file system is ext4 and always has been.
What is going on?
Hello @deroberts1 
I assume you use timeshift-autosnap to make backups before upgrades and that result in this error.
As the error message states, the root file system must be btrfs to create a btrfs snapshot with timeshift, since this is a btrfs function. It is not enough that the target backup drive has a btrfs file system.
You must use rsync in timeshift in your scenario.
Ok, I told Timeshift to make its snapshot on a ext4 partition on my internal HD.
I used rsync. And it made the snapshot:
“RSYNC Snapshot saved successfully (86s)”
THEN: It says 2/6 Making BTRFS snapshot…
followed by the same error message:
Root filesystem is not btrfs! exiting…
BUT IT JUST MADE A SNAPSHOT!
If you used the terminal to trigger the backup, then post the full output. Anything outside of timeshift must trigger this event…
udo pacman -Syyu
:: Synchronizing package databases…
core 167.5 KiB 356 KiB/s 00:00 [##] 100%
extra 1878.8 KiB 775 KiB/s 00:02 [##] 100%
community 6.9 MiB 785 KiB/s 00:09 [##] 100%
multilib 179.6 KiB 561 KiB/s 00:00 [##] 100%
:: Starting full system upgrade…
warning: ignoring package replacement (linux510-rt-5.10.90_rt60-1 => linux515-rt-5.15.27_rt35-1)
warning: linux515-rt: ignoring package upgrade (5.15.13_rt26-1 => 5.15.27_rt35-1)
resolving dependencies…
looking for conflicting packages…
Packages (295) abseil-cpp-20211102.0-2
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ostree-2022.2-1 oxygen-5.24.3-1
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plasma-browser-integration-5.24.3-1
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ttf-ubuntu-font-family-0.83-8
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vulkan-mesa-layers-21.3.7-2
vulkan-radeon-21.3.7-2
vulkan-tools-1.2.203-2 waylandpp-0.2.9-2
web-installer-url-handler-2.3-1 wine-7.4-1
wireless-regdb-2022.02.18-1
wlroots-0.15.1-3
x264-3:0.164.r3081.19856cc-2 x265-3.5-3
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xxhash-0.8.1-2 yakuake-21.12.3-1
yay-11.1.2-1 zimg-3.0.3-2
Total Installed Size: 4707.24 MiB
Net Upgrade Size: 26.08 MiB
:: Proceed with installation? [Y/n] Y
(295/295) checking keys in keyring [##] 100%
(295/295) checking package integrity [##] 100%
(295/295) loading package files [##] 100%
(295/295) checking for file conflicts [##] 100%
(295/295) checking available disk space [##] 100%
:: Running pre-transaction hooks…
(1/6) Creating Timeshift snapshot before upgrade…
/dev/sdb5 is mounted at: /run/timeshift/backup, options: rw,relatime
(2/6) Making BTRFS snapshot…
Root filesystem is not btrfs! exiting…
error: command failed to execute correctly
error: failed to commit transaction (failed to run transaction hooks)
Errors occurred, no packages were upgraded.
The thing is that this time I reformatted the external USB drive partition back to ext4 and used rsync. It created the same error:
(2/6) Making BTRFS snapshot…
Root filesystem is not btrfs! exiting…
I think I see the problem: btrfs-autosnap is installed and tries to run after the normal autosnap. But it will not uninstall.
I try running: sudo pacman -Rdd -n btrfs-autosnap
But it does not remove because the btrfs-autosnapp script wants to run first.
SOLVED:
I simply renamed this file:
/usr/share/libalpm/hooks/01-btrfs-autosnap.hook.
After that, the update went smoothly.
Not pretty, but it worked.