Check how much disk space is left
You can check how much disk space is left with Disk Usage Analyzer or System Monitor.
Check with Disk Usage Analyzer
To check the free disk space and disk capacity using Disk Usage Analyzer:
Open Disk Usage Analyzer from the Activities overview. The window will display a list of file locations together with the usage and capacity of each.
Click one of the items in the list to view a detailed summary of the usage for that item. Click the menu button, and then Scan Folder… or Scan Remote Folder… to scan a different location.
The information is displayed according to Folder, Size, Contents and when the data was last Modified. See more details in Disk Usage Analyzer.
Check with System Monitor
To check the free disk space and disk capacity with System Monitor:
Open the System Monitor application from the Activities overview.
Select the File Systems tab to view the system’s partitions and disk space usage. The information is displayed according to Total, Free, Available and Used.
What if the disk is too full?
If the disk is too full you should:
Delete files that aren’t important or that you won’t use anymore.
Make backups of the important files that you won’t need for a while and delete them from the hard drive.