You're probably not using 'gnome-shell-extension-brightness-control'.
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apport-collect 1892747
** Package changed: gnome-shell-extension-brightness-control (Ubuntu) =>
gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1892747
Title:
Ubuntu hangs while changing display brightness from keyboard shortcut
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