Observe partition disk usage
See existing partitions
Check which partition is getting full
$ df -lhT or $ df --local --human-readable -T Filesystem Type Size Used Avail Use% Mounted on /dev/sda1 ext4 100M 77M 33M 77% / ...
When your ?Home directory becomes full, you will not be able to save any file, and some applications might refuse to start correctly.
When your temporary directory (/tmp) directory becomes full, many application will fail with error messages such as:
cannot create temp file for document: No space left on device