I found this site where it says all the things I need to do and the commands in Terminal and Everything. So Now I need to type in
sudo apt-get update.
I get this error:
tomi@ubuntu:~$ sudo apt-get update N: Ignoring file 'getdeb.list.bck' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension E: Type '' is not known on line 3 in source list /etc/apt/sources.list.d/libdvdcss.list E: The list of sources could not be read.