[Bug 2027826] [NEW] Mantic Cloud-Images on amd64 Fail To Preseed Snaps

[John Chittum]

Public bug reported:

Starting on June 19th, Mantic Cloud Images (in development) on amd64 are
failing to pre-seed snaps provided in Seeds. This is observable by
taking any Mantic Cloud Server (not minimal) image and checking if `lxd`
is installed.

Troubleshooting steps so far:

1. using `ubuntu-bartender`[0] and local checkouts, I bisected `livecd-
rootfs`, starting from commits before June 19th. Unfortunately, due to
various other build issues, I was not able to successfully find a
commit. Commits <= tag 2.849 fail to build, and commits after fail to
have snaps preseeded. More work can be done here to find a successfully
building commit (I did not go a back through the entire history, only to
tag 2.848)

2. I attempted a revert of tag 2.890 specific code, which landed around
the time failures to pre-seed began. Reverting that specific code did
not result in fixing the issue.

3. a build and check of the log at `lb_chroot_cache save` will show the
issue. in a successful build, the apt cache is updated and snaps are
preseeded.


[0] https://github.com/ubuntu-bartenders/ubuntu-old-fashioned

** Affects: cloud-images
     Importance: Undecided
         Status: New

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2027826

Title:
  Mantic Cloud-Images on amd64 Fail To Preseed Snaps

Status in cloud-images:
  New
Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  Starting on June 19th, Mantic Cloud Images (in development) on amd64
  are failing to pre-seed snaps provided in Seeds. This is observable by
  taking any Mantic Cloud Server (not minimal) image and checking if
  `lxd` is installed.

  Troubleshooting steps so far:

  1. using `ubuntu-bartender`[0] and local checkouts, I bisected
  `livecd-rootfs`, starting from commits before June 19th.
  Unfortunately, due to various other build issues, I was not able to
  successfully find a commit. Commits <= tag 2.849 fail to build, and
  commits after fail to have snaps preseeded. More work can be done here
  to find a successfully building commit (I did not go a back through
  the entire history, only to tag 2.848)

  2. I attempted a revert of tag 2.890 specific code, which landed
  around the time failures to pre-seed began. Reverting that specific
  code did not result in fixing the issue.

  3. a build and check of the log at `lb_chroot_cache save` will show
  the issue. in a successful build, the apt cache is updated and snaps
  are preseeded.


  [0] https://github.com/ubuntu-bartenders/ubuntu-old-fashioned

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