I am actually using Ubuntu 14.04LTS. I kept the larger files in a .(dot)folder in administrator directory and my total disk space is filled.
I previously got the information that I have low disk space. Even though the desktop is blank and each and every time when I login in administrator it will give blank desktop it doesn't show any folder or applications.
But I can easily login into guest session, so how can I delete those administrator files to make free space by using guest session or some thing else?

/home/rootdirectory? Why does somebody keeps there anything at all, and in so big amounts? This is odd. – Hi-Angel Nov 22 '17 at 18:25cd /path/to/you/dirto enter the directory with files, then check if you see them with the commandls. To remove files userm. See also why it is bad to login as root. And no, you can't remove files belonging to root through a usual user — what would be the point of having an account with lower privileges if you could? – Hi-Angel Nov 22 '17 at 18:54