Very similar thing happened on Lubuntu 20.04, `apt-get dist-upgrade`
said
Unpacking snapd (2.47.1+20.04) over (2.46.1+20.04) ...
Setting up snapd (2.47.1+20.04) ...
Installing new version of config file
/etc/apparmor.d/usr.lib.snapd.snap-confine.real ...
and hung. `pstree` just showed `apt-get---dpkg---snapd.postinst` (no
children). It ignored `SIGINT` and `SIGTERM`. `ps auxwww` shows
root 4091 0.0 0.0 2608 1740 pts/1 S+ 09:42 0:00
/bin/sh /var/lib/dpkg/info/snapd.postinst configure 2.46.1+20.04
and `ls -l /proc/4091/fd` gives
lrwx------ 1 root root 64 Nov 3 11:43 0 -> /dev/pts/1
l-wx------ 1 root root 64 Nov 3 11:44 1 -> /dev/null
lr-x------ 1 root root 64 Nov 3 11:44 10 ->
/var/lib/dpkg/info/snapd.postinst
lrwx------ 1 root root 64 Nov 3 11:44 11 -> /dev/pts/1
lrwx------ 1 root root 64 Nov 3 11:44 2 -> /dev/pts/1
(timestamps being the current time of the `ls`, not the process start
time which was about 2 hours earlier) I was connecting to the machine
via `ssh` from elsewhere on our home network.
After `kill -9 4091` the parent `dpkg` process was still hung, `ps
auxwww` gives:
root 4090 0.0 0.2 18092 9932 pts/1 Ss+ 09:42 0:00
/usr/bin/dpkg --status-fd 55 --configure --pending
and `ls -l /proc/4090/fd` gives:
lrwx------ 1 root root 64 Nov 3 11:49 0 -> /dev/pts/1
lrwx------ 1 root root 64 Nov 3 11:49 1 -> /dev/pts/1
lrwx------ 1 root root 64 Nov 3 11:49 2 -> /dev/pts/1
lrwx------ 1 root root 64 Nov 3 11:49 3 -> /var/lib/dpkg/lock
l-wx------ 1 root root 64 Nov 3 11:49 4 -> /var/lib/dpkg/updates/tmp.i
lrwx------ 1 root root 64 Nov 3 11:49 5 -> /var/lib/dpkg/triggers/Lock
l-wx------ 1 root root 64 Nov 3 11:49 55 -> 'pipe:[55607]'
lr-x------ 1 root root 64 Nov 3 11:49 6 -> /var/lib/dpkg/triggers/Unincorp
l-wx------ 1 root root 64 Nov 3 11:49 7 -> /var/log/dpkg.log
lr-x------ 1 root root 64 Nov 3 11:49 8 -> /var/lib/dpkg/diversions
After `kill -9 4090` the original SSH session gets
E: Sub-process /usr/bin/dpkg exited unexpectedly
W: Operation was interrupted before it could finish
and dropped back to root prompt. I then tried `dpkg --configure -a` and
it apparently went straight through:
Setting up snapd (2.47.1+20.04) ...
snapd.failure.service is a disabled or a static unit, not starting it.
snapd.snap-repair.service is a disabled or a static unit, not starting it.
and then carried on setting up the other packages. So I'm logging the
above in the hope that somebody can read more meaning into it than I
can.
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https://bugs.launchpad.net/bugs/1868706
Title:
Snapd postinst script hangs
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