Comment 3 for bug 1791691

http://cloud-images.ubuntu.com/cosmic/20180906/unpacked/cosmic-daily.changelog outlines the changed packages between the two images. I strongly suspect that the root cause of this is the systemd environment generator added in the latest version of snapd, so I've added snapd to this bug.

The changelog for the latest snapd version:

snapd (2.35.1+18.10) cosmic; urgency=medium

  * New upstream release, LP: #1786438
    - packaging/fedora: Merge changes from Fedora Dist-Git
    - snapcraft: do not use --diry in mkversion.sh
    - cmd: add systemd environment generator
    - snap-confine: map /var/lib/extrausers into snaps mount-namespace
    - tests: cherry-pick test fixes from master for 2.35
    - systemd: do not run "snapd.snap-repair.service.in on firstboot
      bootstrap
    - interfaces: retain order of inserted security backends
    - selftest: detect if apparmor is unusable and error

 -- Michael Vogt <email address hidden> Mon, 03 Sep 2018 14:44:06 +0200