[Bug 2039284] Re: v4l2loopback-dkms from mantic is not compatible with kernel from lunar and fails when upgrading from lunar to mantic

[Thomas Debesse]

Maybe not building the new module with the old kernel is enough? One
problem is that DKMS also builds for the current kernel (which is
necessarily the one from the old release at the time of the upgrade).

But a perfect fix would be that the DKMS module would be compatible with
both the new kernel from new Ubuntu release and the old kernel from old
Ubuntu release.

The bug 2039283 is very similar, with virtualbox-dkms reproducing the
same issue, maybe other DKMS packages are affected by the same problem.

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https://bugs.launchpad.net/bugs/2039284

Title:
  v4l2loopback-dkms from mantic is not compatible with kernel from lunar
  and fails when upgrading from lunar to mantic

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in v4l2loopback package in Ubuntu:
  Triaged

Bug description:
  When upgrading from lunar to mantic I got this error:

  ```
  Loading new v4l2loopback-0.12.7 DKMS files...
  Building for 6.2.0-33-generic 6.5.0-9-generic
  Building initial module for 6.2.0-33-generic
  ERROR (dkms apport): kernel package linux-headers-6.2.0-33-generic is not supported
  Error! Bad return status for module build on kernel: 6.2.0-33-generic (x86_64)
  Consult /var/lib/dkms/v4l2loopback/0.12.7/build/make.log for more information.
  dpkg: error processing package v4l2loopback-dkms (--configure):
   installed v4l2loopback-dkms package post-installation script subprocess returned error exit status 10
  Processing triggers for man-db (2.11.2-3) ...
  Errors were encountered while processing:
   v4l2loopback-dkms
  ```

  It looks like v4l2loopback-dkms from mantic is not compatible with
  lunar kernel, but since I'm upgrading from lunar to mantic I'm still
  running the lunar kernel.

  I was able to finish the mantic installation by doing:

  ```
  apt-get remove v4l2loopback-dkms
  apt-get --fix-broken install
  ```

  I'll have to manually reinstall v4l2loopback-dkms after the reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.10
  Package: v4l2loopback-dkms (not installed)
  ProcVersionSignature: Ubuntu 6.2.0-33.33-generic 6.2.16
  Uname: Linux 6.2.0-33-generic x86_64
  NonfreeKernelModules: vboxnetadp vboxnetflt vboxdrv amddrm_ttm_helper amdttm amdxcp amddrm_buddy amd_sched amdkcl
  ApportVersion: 2.27.0-0ubuntu5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: GNOME
  Date: Fri Oct 13 16:04:02 2023
  RebootRequiredPkgs: Error: path contained symlinks.
  SourcePackage: v4l2loopback
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2018-06-16T17:39:00.798346

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