Answer by rtaft for Lost full screen on virtualbox
Reinstall Guest Additions on the VM. It's possible that it was corrupted during the upgrade, or a version mismatch could have occurred after upgrading. I recently ran into this issue upgrading the...
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I updated my virtual box hosted ubuntu from Ubuntu version 20.10 to 21.04. Upon update, the Ubuntu is no longer in full screen.Host: "20.04.2 LTS (Focal Fossa)" Virtualbox version: Version...
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