How can I resize my filesystem partition?
you can boot from ubuntu cd/dvd/usb instalation,
choose "try ubuntu"
search for "gparted" application on dash,
launch it,
and it will show you like this (example, it can different from yours)
to resize, click the partition you want to change,
click resize (red mark)
and it will show like this
to resize you can move (the red mark)
hope this will solve your problem