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[Rob <1972762@xxxxxxxxxxxxxxxxxx>]

the Ubuntu-24 bundled package "firefox" is a snap package now; so if you attempt to install plain "firefox", it will also install "snapd" package; this one in turn depends on "apparmor" package so that will also get installed.
But doing so inside an LXC container breaks the whole shebang, because "apparmor" seems to be lacking a lot of rules for LXC containers. So when you try to install "snapd", you get the following errors:

apparmor_parser: Unable to replace "mount-namespace-capture-helper".  apparmor_parser: Access denied. You need policy admin privileges to manage profiles.
apparmor_parser: Unable to replace "/usr/lib/snapd/snap-confine".  apparmor_parser: Access denied. You need policy admin privileges to manage profiles.

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You received this bug notification because you are a member of UBUNTU -
AL - BR, which is subscribed to Chromium Browser.
https://bugs.launchpad.net/bugs/1972762

Title:
  Firefox and Chromium snaps preventing apps and devices from working
  correctly.

Status in Chromium Browser:
  New
Status in Mozilla Firefox:
  New
Status in snapd:
  New
Status in r-cran-plotly package in Ubuntu:
  Confirmed

Bug description:
  Many apps put files in /tmp or ~/.cache to then open those files with
  other apps. Files won't open from those locations with the Firefox
  snap. Just within a few days of using, I've found quite a few apps
  that don't work as they should or seem broken as a result.

  * Any archive manager (xarchive uses /tmp, file-roller and engrampa use ~/.cache, peazip uses ~/.ptmp)
  * Catfish (uses /tmp also for opening files in archives)
  * fish (fish_config uses an html file in /tmp and uses a browser for configuration)

  Other things not working:

  * WebUSB (Used in Chromium for securely interacting with USB devices, installing and updating Android devices, etc)
  * USBMidi (Used in Chromium and Firefox for using Midi instruments)

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