I'm not going to rehash the entire feature set but I'll note a few
highly relevant things when I think about this conceptually.

1) The problem with a backport is more than just the KEK and DB plugins, the 
metadata has been changed into a new format that is ready for PQC.
https://bugs.launchpad.net/ubuntu/jammy/+source/fwupd/+bug/2056548

2) Also; the plugin architecture has changed significantly; plugins are
now compiled in as a single library.  So you can't just have a drop in
plugin for older versions.

3) The plugin ABI has changed (it's not considered stable).  Adding
support for the ABI used by these plugins will likely mean compromising
the ABI of the existing ones.

In my mind it really is a giant amount of work to port.  By virtue of
Ubuntu using a minimally patched fwupd you will lose all of the
confidence in cross-distro real world testing of a privileged service
that consumes artifacts from the web like this.

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https://bugs.launchpad.net/bugs/2142578

Title:
  [SRU] fwupd backports for KEK and db updates

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