Ve zdrojích to mám uvedeno správně, ale vypisuje to chybovou hlášku viz. výše.
Výpis sources.list:
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main
deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)
deb-src http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)