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[Launchpad Bug Tracker <1989603@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug by Paride Legovini (paride):

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
[...]

** Affects: snapd (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Can't purge snapd in LXD: rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/...': Function not implemented
https://bugs.launchpad.net/bugs/1989603
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