Error with automatic update

I’m getting the following error when trying to use do an update using YaST2

Subprocess failed. Error: RPM failed: installing package kernel-source-2.6.31.12-0.1.1.noarch needs 429MB on the / filesystem

Looks like your / partition is too small.
Open a terminal and type du. Look at the ‘mounted on’ column and see how much space you have left on /.