trying to upgrade cups

upgrading via remote file system.

getting the following message;

There is not enough disk space in the common partition to perform the upgrade. Please use either the Platform Command Line Interface or the Real-Time Monitoring Tool (RTMT) to free space on the common partition.

Anyone have any ideas on how to get by this?

don't think you can do via RTMT but would very much like to know how to do via CLI and what to delete specifically.