The error indicates a malformed entry in a source file, which causes the update process to abort. To fix it, you have to either fix the entry (if you know what the right entry should look like) or remove it altogether (that's what I'm going to describe, as it's the fastest way to enable you to update your system again).
First, you need to open the file containing the bad entry. The filename is given in the error message, in your example /etc/apt/sources.list.d/some-ppa.list. Press Alt + F2, and type
gksu gedit /etc/apt/sources.list.d/some-ppa.list
and press Enter. After entering your password, you should now see the file opened in the text editor gedit.
Now you need to locate the malformed entry. It should be on the line number given in the error message - in your case that would be line 1.
This line should be incomplete and start with the unknown type the update process is complaining about (here ain). Just delete the whole line, save the file, and close the editor*.
That's it. You should now be able to successfully run the update process!
*) If that entry is all that's in the file, then you can just delete the file.
- Press Alt + F2,
gnome-terminal and press Enter to start a GNOME terminal,
sudo rm /etc/apt/sources.list.d/some-ppa.list (password required), and
- You are done! :-)