[Bug 1990884] Re: snap-preseed hangs indefinitely with firefox snap

[John Chittum]

small poke -- will this be rectified soon, to ensure Kinetic releases
are pre-seeded?

If not, we'll need to put a "skip" in the livecd-rootfs code to ensure
CPC projects are being preseeded (we weren't hit by the specific bug for
firefox,and thus we are having downstream issues with all our tests
failing due to pre-seed not happening and boot times being too slow)

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Title:
  snap-preseed hangs indefinitely with firefox snap

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in snapd package in Ubuntu:
  Fix Committed

Bug description:
  During our automated image builds, we found a scenario where `snap-
  preseed` was hanging indefinitely. The logs are as follows:

  ```
  sudo /usr/lib/snapd/snap-preseed /home/jawn-smith/sandbox/chroot/
  ubuntu classic preseedingstarting to preseed root: /home/jawn-smith/sandbox/chroot
  using snapd binary: /usr/lib/snapd/snapd (2.57.1+22.10.1)
  AppArmor status: apparmor is enabled and all features are available
  2022/09/26 19:56:40.922864 main.go:57: running for preseeding
  2022/09/26 19:56:40.923469 overlord.go:263: Acquiring state lock file
  2022/09/26 19:56:40.923655 overlord.go:268: Acquired state lock file
  2022/09/26 19:56:40.930761 daemon.go:247: started snapd/2.57.1+22.10.1 (series 16; classic) ubuntu/22.10 (amd64) linux/5.19.0-15-generic.
  2022/09/26 19:56:40.936802 daemon.go:340: adjusting startup timeout by 30s (pessimistic estimate of 30s plus 5s per snap)
  2022/09/26 19:56:41.116159 helpers.go:147: error trying to compare the snap system key: system-key missing on disk
  ```

  I was able to reproduce the behavior by running the following commands
  on a kinetic system:

  ```
  sudo debootstrap --variant=minbase --arch=amd64 kinetic chroot
  sudo snap prepare-image --arch=amd64 --snap=core --snap=firefox --snap=core20 --snap=gtk-common-themes --snap=gnome-3-38-2004 --snap=bare --classic generic.model chroot
  for mountpoint in /dev /proc /sys /sys/kernel/security/; do sudo mount --bind $mountpoint chroot/$mountpoint; done
  sudo chroot chroot apt install -y squashfs-tools snapd
  sudo /usr/lib/snapd/snap-preseed --reset <full path to chroot>
  sudo /usr/lib/snapd/snap-preseed <full path to chroot>
  ```

  In this scenario I am using the following generic.model:

  ```
  type: model
  authority-id: generic
  series: 16
  brand-id: generic
  model: generic-classic
  classic: true
  timestamp: 2017-07-27T00:00:00.0Z
  sign-key-sha3-384: d-JcZF9nD9eBw7bwMnH61x-bklnQOhQud1Is6o_cn2wTj8EYDi9musrIT9z2MdAa

  AcLBXAQAAQoABgUCWYuXiAAKCRAdLQyY+/mCiST0D/0XGQauzV2bbTEy6DkrR1jlNbI6x8vfIdS8
  KvEWYvzOWNhNlVSfwNOkFjs3uMHgCO6/fCg03wGXTyV9D7ZgrMeUzWrYp6EmXk8/LQSaBnff86XO
  4/vYyfyvEYavhF0kQ6QGg8Cqr0EaMyw0x9/zWEO/Ll9fH/8nv9qcQq8N4AbebNvNxtGsCmJuXpSe
  2rxl3Dw8XarYBmqgcBQhXxRNpa6/AgaTNBpPOTqgNA8ZtmbZwYLuaFjpZP410aJSs+evSKepy/ce
  +zTA7RB3384YQVeZDdTudX2fGtuCnBZBAJ+NYlk0t8VFXxyOhyMSXeylSpNSx4pCqmUZRyaf5SDS
  g1XxJet4IP0stZH1SfPOwc9oE81/bJlKsb9QIQKQRewvtUCLfe9a6Vy/CYd2elvcWOmeANVrJK0m
  nRaz6VBm09RJTuwUT6vNugXSOCeF7W3WN1RHJuex0zw+nP3eCehxFSr33YrVniaA7zGfjXvS8tKx
  AINNQB4g2fpfet4na6lPPMYM41WHIHPCMTz/fJQ6dZBSEg6UUZ/GiQhGEfWPBteK7yd9pQ8qB3fj
  ER4UvKnR7hcVI26e3NGNkXP5kp0SFCkV5NQs8rzXzokpB7p/V5Pnqp3Km6wu45cU6UiTZFhR2IMT
  l+6AMtrS4gDGHktOhwfmOMWqmhvR/INF+TjaWbsB6g==
  ```

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