[Bug 1864608] [NEW] Focal desktop images fail to build with: error: cannot validate seed: cannot use snap XXX base "core18" is missing

[Jean-Baptiste Lallement]

Public bug reported:

Since version 2.645 of livecd-rootfs Desktop images of Focal fail to
build with:

error: cannot validate seed:
- cannot use snap "gnome-3-28-1804": base "core18" is missing
- cannot use snap "gnome-calculator": base "core18" is missing
- cannot use snap "gnome-characters": base "core18" is missing
- cannot use snap "gnome-logs": base "core18" is missing
- cannot use snap "gtk-common-themes": base "core18" is missing

https://launchpadlibrarian.net/466333748/buildlog_ubuntu_focal_amd64_ubuntu_BUILDING.txt.gz

** Affects: livecd-rootfs (Ubuntu)
     Importance: Critical
         Status: Confirmed

** Changed in: livecd-rootfs (Ubuntu)
   Importance: Undecided => Critical

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Confirmed

** Description changed:

  Since version 2.645 of livecd-rootfs Desktop images of Focal fail to
  build with:
  
  error: cannot validate seed:
  - cannot use snap "gnome-3-28-1804": base "core18" is missing
  - cannot use snap "gnome-calculator": base "core18" is missing
  - cannot use snap "gnome-characters": base "core18" is missing
  - cannot use snap "gnome-logs": base "core18" is missing
  - cannot use snap "gtk-common-themes": base "core18" is missing
+ 
+ https://launchpadlibrarian.net/466333748/buildlog_ubuntu_focal_amd64_ubuntu_BUILDING.txt.gz

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https://bugs.launchpad.net/bugs/1864608

Title:
  Focal desktop images fail to build with: error: cannot validate seed:
  cannot use snap XXX base "core18" is missing

Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  Since version 2.645 of livecd-rootfs Desktop images of Focal fail to
  build with:

  error: cannot validate seed:
  - cannot use snap "gnome-3-28-1804": base "core18" is missing
  - cannot use snap "gnome-calculator": base "core18" is missing
  - cannot use snap "gnome-characters": base "core18" is missing
  - cannot use snap "gnome-logs": base "core18" is missing
  - cannot use snap "gtk-common-themes": base "core18" is missing

  https://launchpadlibrarian.net/466333748/buildlog_ubuntu_focal_amd64_ubuntu_BUILDING.txt.gz

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