I selected my home directory as destination to recover some deleted files using Photorec from another partition(NTFS). During the file recovery,my file system partition ran out of space & Photorec halted.Then I deleted all of the recovered files from my home directory. Then I got an error message "can not find or .... locate graphic driver...."(I can't recall exactly what it was) in a dialogue box on a black screen.
Then I booted to my backup OS,Linux Mint, in the file manager it showed my Ubuntu partition is completely used & 0 bytes free, then I moved some of my large video file from my home directory in Ubuntu to another partition & freed some space.
After freeing some space, I booted up Ubuntu & there was no error messages. But my system partition is 90% used.
In the disk usage analyzer,indicates that my file system has only used 23.5GB.
But disk usage analyzer also indicates below the tool bar: used 82.5GB & available 8.3GB.
How can I gain the lost disk space?