Ubuntu – Not enough free disk space – Error

Sometimes when Ubuntu does its updates, I will get an error dialog saying: Not enough free disk space. The upgrade needs a total of XX.X M free space on disk ‘/boot’…

The error appears to be caused by old kernels that have not been removed from the system. The easiest solution I’ve found is a GUI interface called Ubuntu Tweak.

Select “Janitor” and then the old kernels and then click on “Clean”. This always corrects the issue for me.