[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lp-2028862 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lp-2028862 into livecd-rootfs:ubuntu/master.

Commit message:
Remove additional dependencies from subiquity units as they are now interfering with the boot process. (LP: #2028862)



Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #2028862 in subiquity: "Mantic hangs during install with continuous 'Job snapd.seeded.service/start running' messages"
  https://bugs.launchpad.net/subiquity/+bug/2028862

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/448655

I think the issue was something like this:

cloud-config runs before systemd-user-sessions

cloud-config runs after snapd.seeded

snap seeding doesn't finish until snap units all start

snap.subiquity.subiquity-service doesn't start until systemd-user-sessions starts

systemd-user-sessions is blocked on cloud-config

-> A cycle (although not visible to systemd for better or worse)
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~mwhudson/livecd-rootfs/+git/livecd-rootfs:lp-2028862 into livecd-rootfs:ubuntu/master.
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