** Changed in: linux (Ubuntu Bionic)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1767133

Title:
  linux-image-4.15.0-20-generic install after upgrade from xenial breaks

Status in linux package in Ubuntu:
  Fix Committed
Status in linux-hwe-edge package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Invalid
Status in linux-hwe-edge source package in Xenial:
  Confirmed
Status in linux source package in Bionic:
  Fix Committed
Status in linux-hwe-edge source package in Bionic:
  Invalid

Bug description:
  [Impact]
  Some upgrades from xenial to bionic break.

  [Test Case]
  Change sources.list from xenial to bionic, then apt install 
linux-image-4.15.0-20-generic.

  [Regression Potential]
  The kernel may be uninstallable if there is no linux-base with the 
appropriate version in the archive.

  ----

  When installing the linux-image-4.15.0-20-generic kernel from bionic
  on xenial breaks because of the unversioned Depends on linux-base.

  /var/lib/dpkg/info/linux-image-4.15.0-20-generic.postinst: 50: 
/var/lib/dpkg/info/linux-image-4.15.0-20-generic.postinst: 
linux-update-symlinks: not found
  dpkg: error processing package linux-image-4.15.0-20-generic (--configure):
   subprocess installed post-installation script returned error exit status 127
  Errors were encountered while processing:
   linux-image-4.15.0-20-generic
  E: Sub-process /usr/bin/dpkg returned an error code (1)

  If the trigger is called, when some meta packages are installed, it
  won't happen. If all packages are upgraded, it's possible linux-base
  is going to be upgraded first, so the problem won't happen either.

  So, not all upgrades will be affected.

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