Comment 13 for bug 2028366

Tested DKMS from proposed

Testbed preparation:

1) Install Lunar

2) Install a good and a bad DKMS (one that builds correctly and one that doesn't):
   2.1) Install evdi-dkms (good DKMS)
   2.2) Install rtl8821ce-dkms 5.5.2.1-0ubuntu10 from Jammy (bad DKMS)

3) Verify DKMS build status:
   $ dkms status
   evdi/1.12.0+dfsg, 6.2.0-27-generic, x86_64: installed
   rtl8821ce/5.5.2.1: added

During the above, the build of rtl8821ce failed.

Verify current brokenness:

1) Unbuild evdi dkms:
   $ sudo dkms unbuild evdi/1.12.0+dfsg --all
   $ dmks status
   evdi/1.12.0+dfsg: added
   rtl8821ce/5.5.2.1: added

2) Reinstall the kernel headers, this triggers a build of all DKMS modules. One of the modules fails to build and the kernel header installation fails as a result of that.
  $ sudo apt install --reinstall linux-headers-6.2.0-27-generic
...
Setting up linux-headers-6.2.0-27-generic (6.2.0-27.28) ...
/etc/kernel/header_postinst.d/dkms:
 * dkms: running auto installation service for kernel 6.2.0-27-generic
...
Error! Bad return status for module build on kernel: 6.2.0-27-generic (x86_64)
Consult /var/lib/dkms/rtl8821ce/5.5.2.1/build/make.log for more information.
...
Errors were encountered while processing:
 linux-headers-6.2.0-27-generic
 rtl8821ce-dkms
needrestart is being skipped since dpkg has failed
E: Sub-process /usr/bin/dpkg returned an error code (1)

OK, confirmed that header installation with a broken DKMS is place fails.

Clean up the testbed and install dkms from proposed:

1) Remove rtl8821ce-dkms
2) Reinstall kernel headers
3) Install dkms 3.0.10-7ubuntu2.1 from proposed
4) Reinstall rtl8821ce-dkms 5.5.2.1-0ubuntu10 from Jammy. Build still fails.
5) Unbuild evdi dkms:
   $ sudo dkms unbuild evdi/1.12.0+dfsg --all
   $ dmks status
   evdi/1.12.0+dfsg: added
   rtl8821ce/5.5.2.1: added

Verify correct behavior of dkms from proposed:

1) Reinstall kernel headers (mimick do-release-upgrade):
   $ RELEASE_UPGRADE_IN_PROGRESS=1 apt install --reinstall linux-headers-6.2.0-27-generic
...
etting up linux-headers-6.2.0-27-generic (6.2.0-27.28) ...
/etc/kernel/header_postinst.d/dkms:
 * dkms: running auto installation service for kernel 6.2.0-27-generic
...
Error! Bad return status for module build on kernel: 6.2.0-27-generic (x86_64)
Consult /var/lib/dkms/rtl8821ce/5.5.2.1/build/make.log for more information.
dkms autoinstall on 6.2.0-27-generic/x86_64 succeeded for evdi
dkms autoinstall on 6.2.0-27-generic/x86_64 failed for rtl8821ce(10)
Error! One or more modules failed to install during autoinstall.
Refer to previous errors for more information.
 * dkms: ignore autoinstall errors for dkms modules
 * dkms: autoinstall for kernel 6.2.0-27-generic
   ...done.
...
   $ echo $?
   0

See above output. Build of rtl8821ce/5.5.2.1 failed but error is ignored and kernel headers are installed successfully.