[Bug 2002470] [NEW] Software & Updates - Authentication Tab - Restore Defaults - no Trusted Software Providers loaded

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Enabled livepatch on two cleanly installed laptops - entered settings
GUI for livepatch by right-clicking on status icon and selecting
'Livepatch Settings...' - navigate to the 'Authentication' tab - click
on the 'Restore Defaults' button - on one laptop, keys are loaded from
the /etc/apt/ and /etc/apt/trusted.gpg.d folders - on the other,
however, nothing happens / no keys are loaded even though the exact same
keys are on both machines. I can't determine why these systems behave
differently as they were both installed using the exact same USB media
using the exact same setup process.

Both laptops are configured with:
Ubuntu 22.04.1 LTS
Livepatch 10.4.1
Gnome Version 42.5

What I expected to happen: Authentication tab's Trusted Software
Providers area gets populated with default keys - i.e., Trusted Software
Providers' keys are displayed

What happened instead: nothing; Authentication tab's Trusted Software
Providers area remains blank - i.e., No keys are displayed in the
Trusted Software Providers area

I don't know if this presents a security vulnerability or not; I guess
it depends on whether or not livepatch would retrieve / install packages
from untrusted sources?  I would expect not, but I'm not certain if
that's true.

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: livepatch
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Software & Updates - Authentication Tab - Restore Defaults - no  Trusted Software Providers loaded
https://bugs.launchpad.net/bugs/2002470
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