[Bug 1681566] Re: nvidia-375 DKMS module not recompiled on upgrade to 17.04

[Brian Murray]

I tested Laney's patch via the following:

- boot a yakkety desktop virtual machine
- installed virtualbox-dkms
- modified /etc/apt/sources.list for zesty
- installed new dkms package
- edited /usr/lib/dkms/common.postinst
- modified /etc/apt/sources.list for yakkety
- ran do-release-upgrade -d
- [...]
- dkms status

bdmurray at clean-yakkety-amd64:~$ dkms status
virtualbox, 5.1.18, 4.10.0-19-generic, x86_64: installed
virtualbox, 5.1.18, 4.8.0-26-generic, x86_64: installed

Also in /var/log/dist-upgrade/apt.log we can see:

Setting up virtualbox-dkms (5.1.18-dfsg-1build1) ...^M
Loading new virtualbox-5.1.18 DKMS files...^M
Building for 4.8.0-26-generic 4.10.0-19-generic^M
Building initial module for 4.8.0-26-generic^M

Notice it is building for two kernels now not one.

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https://bugs.launchpad.net/bugs/1681566

Title:
  nvidia-375 DKMS module not recompiled on upgrade to 17.04

Status in dkms package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-375 package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid
Status in virtualbox package in Ubuntu:
  Confirmed

Bug description:
  When upgrading from 16.10 to 17.04 using `update-manager -d`, the
  `nvidia-375` DKMS modules are not compiled for the new kernel.

  The result is that the user must run `apt install --reinstall
  nvidia-375` and reboot.

  To reproduce this:

  - Clean install of 16.10 on a system with NVIDIA graphics
  - Install `nvidia-375`
  - Run `update-manager -d`, complete all steps, then reboot
  - You will be unable to login until running `apt install --reinstall nvidia-375`

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