[Bug 1776622] Re: snapd updates on focal never finish installing. Can't install any other updates.

[Michael Vogt]

This problem is triggered by incorrect "/var/lib/snapd/seed/seed.yaml"
files. At various points during the development cycles they were
incorrect and that has (almost) no effect on the live-cd or the
installed system. However on the next snapd refresh it would trigger the
hang people are experiencing. The hang is caused by services waiting for
"snapd" to finish seeding but that never happens because the seed.yaml
is incorrect.

The best workaround is to

$ sudo mv /var/lib/snapd/seed/seed.yaml  /var/lib/snapd/seed/seed.yaml
.disabled

and re-run the upgrade. Versions of snapd from ~April 2020 will do this
automatically for you if they detect a broken seed.

So I will close this bug as fixed because there is an automatic
workaround in snapd now. The tooling around the livecd got also improved
AIUI so that incorrect seed.yaml should be much harder to create now.

** Changed in: snapd
       Status: Confirmed => Fix Released

** Changed in: snapd (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1776622

Title:
  snapd updates on focal never finish installing. Can't install any
  other updates.

Status in snapd:
  Fix Released
Status in snapd package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Invalid

Bug description:
  snapd (2.33+18.10ubuntu3) cosmic never finishes installing. Can't
  install any other updates.

  The first time I gave up waiting and killed it. Then...

  $ sudo apt full-upgrade
  E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

  $ sudo dpkg --configure -a
  Setting up snapd (2.33+18.10ubuntu3) ...
  snapd.snap-repair.service is a disabled or a static unit, not starting it.

  << never ends >>

  All the while the snap and snapd process use about 0.3% CPU (which is
  more than usual).

  WORKAROUND:

  sudo killall apt dpkg
  sudo dpkg -r snapd gnome-software-plugin-snap
  sudo apt update
  sudo apt full-upgrade

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