Hi, had a first look at this, THE LINE OF CODE THAT CAUSES THE FAILURE: ----------------------------------------- $ ls /var/lib/dpkg/info/snapd.* > snapd.prerm snapd.postrm ...
See: https://github.com/canonical/snapd/blob/master/packaging/ubuntu-16.04/snapd.postrm As per log: "Removing snap lxd and revision 23541" => https://github.com/canonical/snapd/blob/master/packaging/ubuntu-16.04/snapd.postrm#L74 which is within the "purge" condition https://github.com/canonical/snapd/blob/master/packaging/ubuntu-16.04/snapd.postrm#L30 This is the line that fails: rm -rf --one-file-system "/var/snap/$snap/common" https://github.com/canonical/snapd/blob/master/packaging/ubuntu-16.04/snapd.postrm#L90 LOOKING AT THE WORLD WITH LXD INSTALLED ---------------------------------------- After installing lxd, and running lxd init, a link /var/snap/lxd/common/var/lib/lxcfs -> /var/snap/lxd/common/shmounts/lxcfs but /var/snap/lxd/common/shmounts/lxcfs does not exist. See: https://paste.ubuntu.com/p/Jg4Z2dbfgd/ So its seems the issue is, that the postrm script tries to remove something that it did not add. QUESTIONS --------- 1) @Paride: for your test, does the symlink actaully pointing to anything, otherwise is not representative of the issue. 2) @LXD team: What is lxd is responsible for populating "/var/snap/lxd/common/shmounts/lxcfs"? 3) @LXD team: Does lxd snap use a remove hook? https://snapcraft.io/docs/supported-snap-hooks#heading--remove -- You received this bug notification because you are a member of Canonical's Ubuntu QA, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1989603 Title: Can't purge snapd in LXD: rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/...': Function not implemented Status in lxd: Fix Released Status in snapd package in Ubuntu: Confirmed Bug description: In LXD containers snapd can't be purge-removed. One tool affected by this bug is autopkgtest-build-lxd, which attempts to purge several packages (including snapd) to create a base image to run autopkgtests on. Steps to reproduce: lxc launch ubuntu:jammy paride-j lxc exec paride-j -- apt-get -y remove --purge snapd Kinetic is also affected, I didn't test older releases. To see how this affects autopkgtest-build-lxd just install autopkgtest and run: autopkgtest-build-lxd ubuntu:jammy This reminds me of LP: #1903967, but it's likely a different issue. --- relevant log excerpt --- [...] Purging configuration files for snapd (2.56.2+22.04ubuntu1) ... Stopping snap.lxd.activate.service Stopping unit snap.lxd.activate.service Waiting until unit snap.lxd.activate.service is stopped [attempt 1] snap.lxd.activate.service is stopped. Removing snap.lxd.activate.service Stopping snap.lxd.daemon.service Stopping unit snap.lxd.daemon.service Waiting until unit snap.lxd.daemon.service is stopped [attempt 1] snap.lxd.daemon.service is stopped. Removing snap.lxd.daemon.service Stopping snap.lxd.user-daemon.service Stopping unit snap.lxd.user-daemon.service Waiting until unit snap.lxd.user-daemon.service is stopped [attempt 1] snap.lxd.user-daemon.service is stopped. Removing snap.lxd.user-daemon.service Stopping snap-core20-1611.mount Stopping unit snap-core20-1611.mount Waiting until unit snap-core20-1611.mount is stopped [attempt 1] snap-core20-1611.mount is stopped. Removing snap core20 and revision 1611 Removing snap-core20-1611.mount Stopping snap-lxd-23541.mount Stopping unit snap-lxd-23541.mount Waiting until unit snap-lxd-23541.mount is stopped [attempt 1] snap-lxd-23541.mount is stopped. Removing snap lxd and revision 23541 rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/cpuinfo': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/meminfo': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/stat': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/uptime': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/diskstats': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/swaps': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/loadavg': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/slabinfo': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/disable': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/above': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/time': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/rejected': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/power': Function not implemented rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/residency': Function not implemented [...] To manage notifications about this bug go to: https://bugs.launchpad.net/lxd/+bug/1989603/+subscriptions -- Mailing list: https://launchpad.net/~canonical-ubuntu-qa Post to : canonical-ubuntu-qa@lists.launchpad.net Unsubscribe : https://launchpad.net/~canonical-ubuntu-qa More help : https://help.launchpad.net/ListHelp
