My guess is you incorrectly added a source to the
/etc/apt/sources.list on line 2.
Try opening up Terminal (Ctrl+Alt+T) and running
sudo nano /etc/apt/sources.list.
A regular source line will look similar to this:
deb http://us.archive.ubuntu.com/ubuntu/ vivid main restricted.
If it doesn't, then remove that line and try running
sudo apt-get update again. If it works, we know that you added a source incorrectly and you can try following those instructions again.
What I'm assuming happened for you specifically is you added the line
sudo apt-get update && sudo apt-get upgrade to
What you should do if this is the case is remove that line entirely, and then uncomment all the source lines (delete all
# characters from the beginning of a line.)
Then, you should save the file and exit out of
Now, when you run
sudo apt-get update && sudo apt-get upgrade it should work and you can continue on following those instructions.