thanks, I have done a backup but I want to avoid just flashing it,

i have installed loads of apps from as many extra/devel/testing repos as i can find. I didn't realise about the space issue. I removed some apps via terminal (ssh from a keyboard i can type on). and then uninstalled most of the rest from app manager. still i have no space

what files can i delete and from where, or is there a cleanup script?

also app manager closes when i try to uncheck or delete the extra repos, is there a way to list and uninstall from terminal?

thanks