It happens in 20.04 too, so it could eventually be a Nouveau bug.
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https://bugs.launchpad.net/bugs/1827810
Title:
Opening videos in VLC makes Ubuntu freeze
To manage notifications abou
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: New => Confirmed
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Looks like a nouveau driver bug.
** Package changed: vlc (Ubuntu) => xserver-xorg-video-nouveau (Ubuntu)
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https://bugs.launchpad.net/bugs/1827810
Title:
Opening videos in VLC makes Ubu
** Package changed: ubuntu => vlc (Ubuntu)
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https://bugs.launchpad.net/bugs/1827810
Title:
Opening videos in VLC makes Ubuntu freeze
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Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
