That looks like a corrupted package, maybe caused by a temporary network
failure.
Can you try running the following command in a terminal?
sudo apt reinstall firefox-locale-it
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1944551
Title:
package firefox-locale-it 85.0.1+build1-0ubuntu0.20.04.1 failed to
install/upgrade: unable to make backup link of './usr/lib/firefox-
addons/extensions/[email protected]' before
installing new version: Input/output error
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