I typed in my terminal:  sudo apt-get update

It came up with the following response: 

E: Type 'sudo' is not known on line 1 in source list /etc/apt/sources.list.d/spotify.list
E: The list of sources could not be read.

I then tried typing this: 

sudo sed -i.bak '1d' ./etc/apt/sources.list.d/spotify.list

It came up with this: 

sed: can't read ./etc/apt/sources.list.d/spotify.list: No such file or directory
joanna@joanna-Aspire-5560:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.


HELP!!!