not enough space for upgrading

[pol]

Hi all, 

I would like to upgrade the linux-image-2.6.17-generic but installation
fails due to 'no space on device'.
Probably it is because of the large amount of space required in the /lib 
My root has is only 150 MB and only 44 MB are available.
The  /lib/modules alone, containing only the 2.6.17-10-generic/ directory,
takes about 56 MB.

Any hints?

Thank you for your help

--
Pol