You can pretty safely delete things (like music or pictures) in your home directory or directories inside your home directory, I wouldn't recommend deleting things not in your home directory, that is where you should land when you log into the cli. It'll be something like: /home/username
pwd : print working (current) directory cd Documents : change directory to Documents cd .. : go 'up' a directory ls : list contents of current directory, to find files rm file.txt : delete file
Once you've got some room to get the gui booted, one thing I've done that clears up some space is removing old kernels, google it for your distro and find a pile of instructions :)
no subject
pwd : print working (current) directory
cd Documents : change directory to Documents
cd .. : go 'up' a directory
ls : list contents of current directory, to find files
rm file.txt : delete file
Once you've got some room to get the gui booted, one thing I've done that clears up some space is removing old kernels, google it for your distro and find a pile of instructions :)