I am upgrading from 9.04 following the update manager button

[intrader]

However, during the update it finds that 'Karmic' announcest Not enough 
free disk space

The upgrade is now aborted. The upgrade needs a total of 2336M free 
space on disk '/'. Please free at least an additional 98.3M of disk 
space on '/'. Empty your trash and remove temporary packages of former 
installations using 'sudo apt-get clean'.
I have 2.2GB free in the partition where /root is.
I have 26GB free in the partition where /home is

How do I proceed?

Thanks