[Bug 1983136] [NEW] [SRU] v4l2loopback-dkms breaks secure boot installation in seed

[Erich Eickmeyer ]

Public bug reported:

[Impact]

 * For users installing Ubuntu Studio 22.04 LTS on secure boot machines,
this is currently not possible as v4l2loopback-dkms is currently seeded.

 * When v4l2loopback-dkms attempts to compile during installation on a
secure boot machine without user interaction with calamares, it
completely fails and the system installation fails.

 * In order to proceed, v4l2loopback-dkms must be removed from the seed
and the ubuntustudio-video meta.

 * This was recently discovered while working with the Lubuntu team and
undergoing extensive testing with the new Calamares. While it was not an
issue with Calamares, it did point to the issue with v4l2loopback and
explained some complaints received in the #ubuntustudio IRC chat.

[Test Plan]

 * Download Ubuntu Studio 22.04 ISO image.

 * Attempt to install on machine with Secure Boot enabled.

 * Installation will fail when v4l2loopback-dkms modules attempt to
compile and install to kernel.

[Where problems could occur]

 * Problems can occur when existing users update and end up with
v4l2loopback-dkms marked as autoremovable and run 'sudo apt autoremove',
which will unexpectedly remove this package from their system.
Unfortunately, there's no good way to mitigate this except to advise to
reinstall this package.

** Affects: ubuntustudio-meta (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ubuntustudio-meta (Ubuntu Jammy)
     Importance: Undecided
         Status: New

** Affects: ubuntustudio-meta (Ubuntu Kinetic)
     Importance: Undecided
         Status: New

** Also affects: ubuntustudio-meta (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: ubuntustudio-meta (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1983136

Title:
  [SRU] v4l2loopback-dkms breaks secure boot installation in seed

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