[Bug 1943816] Re: "ubuntu-drivers install" needs to be used when installing nvidia-driver if enabling "third-party packages"

[Dirk Su]

debdiff for focal

** Patch added: "ubuntu-drivers-common_0.9.0~0.20.04.3.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1943816/+attachment/5537831/+files/ubuntu-drivers-common_0.9.0~0.20.04.3.debdiff

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https://bugs.launchpad.net/bugs/1943816

Title:
  "ubuntu-drivers install" needs to be used when installing nvidia-
  driver if enabling "third-party packages"

Status in OEM Priority Project:
  Confirmed
Status in subiquity:
  New
Status in ubiquity package in Ubuntu:
  New
Status in ubuntu-drivers-common package in Ubuntu:
  Fix Released

Bug description:
  ubiquity calls
  ```
  ubuntu-drivers install $FREEONLY $NOOEM --package-list /run/ubuntu-drivers.autoinstall
  ```
  to generate package list during live system but "ubuntu-drivers install" not only install packages but also create some config files for switching nvidia mode (e.g. on-demand) and change the runtime config as well (e.g. modify the iniramfs).

  Thus, not only package list needs to be referred but also the
  configuration.

  ---

  In ubuntu-drivers-common, which read the "/run/ubuntu-drivers.autoinstall" to install package. It also skipping the nvidia-mode changing (made by ubuntu-drivers install).
  ```
  $ cat ubiquity/target-config/31ubuntu_driver_packages
  #!/bin/sh
  set -e

  # install all packages that "ubuntu-drivers autoinstall" installed into the
  # live system. Ubiquity calls this with --package-list /run/ubuntu-drivers.autoinstall

  PKGLIST=/run/ubuntu-drivers.autoinstall
  [ -e $PKGLIST ] || exit 0

  for p in `cat $PKGLIST`; do
      apt-install $p
  done
  ```

  ---

  We need to use a same approach to make sure the nvidia mode is same on
  a same system (either all handing by ubuntu-drivers install or change
  the logic to maintainer script in each package).

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