> This is an improvement to the current situation of aborting release
upgrade half way through.

Is it? If the user ends up with a broken DKMS package on release
upgrade, then at least they'll know about it. But if we silently ignore
the failure, the release upgrade will finish pretending that it was
successful when it was not, and then what if they find the system broken
later?

> Further UX / hooks might be needed in the release upgrade to complete
the story of asking the user what they want to do with regressed dkms
modules.

I agree that this is appropriate to fix in SRUs, but can we fix the
entire story rather than iterating in the stable release?

I prefer not to move the goalposts but I think the above is a big enough
concern to be worth considering first.

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https://bugs.launchpad.net/bugs/2028366

Title:
  Kernel header installation fails for incompatible DKMS modules

Status in dkms package in Ubuntu:
  Fix Released
Status in dkms source package in Jammy:
  Confirmed
Status in dkms source package in Lunar:
  Fix Committed
Status in dkms source package in Mantic:
  Fix Released

Bug description:
  [ Impact ]

  If a new kernel is installed, all installed DKMS modules are built for
  that new kernel. There might be incompatible modules that won't
  compile for the new kernel which results in a kernel header package
  installation failure. That's bad and not really correct, the
  incompatible DKMS module is the problem and not the new kernel.

  In this case, DKMS module build failures should be ignored so that the
  kernel installation completes.

  This is especially acute during release-upgrades, as dkms modules are
  upgraded out of order, and major kernel version are upgraded out of
  order. Majority of the time there is a new dkms available, which
  should attempt build & load.

  However, many modules are often remain broken, no longer needed, or
  need user to fetch updated versions themselves.

  [ Test Plan ]

   * Install jammy

   * Add module that support v5.15 kernel, but fails to compile with any
  newer kernels (one can find examples of such dkms modules in the
  archive, or out of the archive)

   * Perform release upgrade with patched dkms pre-installed

   * Release upgrade should succeed, despite unable to compile all dkms
  modules

  [ Where problems could occur ]

   * This is an improvement to the current situation of aborting release
  upgrade half way through. It doesn't quite resolve the UX to notify
  the user which dkms modules did not manage to compile, or to ask user
  to uninstall or to update them. Further UX / hooks might be needed in
  the release upgrade to complete the story of asking the user what they
  want to do with regressed dkms modules.

  [ Other Info ]
   
   * See lots and lots of upgrade bugs, failing on dkms module installation

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