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Setting up appstream (0.9.4-1ubuntu1) ...

** (appstreamcli:2456): CRITICAL **: Error while moving old database out of the way.
AppStream cache update failed.
Processing triggers for man-db (2.7.5-1) ...

參閱

https://bugs.launchpad.net/ubuntu/+sour ... ug/1579712
Refresh hangs indefinitely, appstreamcli using 100% CPU

https://ubuntuforums.org/showthread.php?t=2337473
Having trouble installing/updating programs with Terminal