Check how much disk space is left

You can check how much disk space is left with Disk Usage Analyzer, System Monitor, or Usage.

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… 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.

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.

To check the free disk space and disk capacity with Usage:

Open the Usage application from the Activities overview.
Select Storage tab to view the system’s total Used and Available disk space, as well as the used by the Operating System and common user’s directories.

Disk space can be freed from user’s directories and its subdirectories by checking the box next to the directory name.

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.