Hello Matteo, It seems that Opera's key expired. Please see: http://deb.opera.com/
This worked for me... (note: you do not need to type the $ or # signs) Applications -> Accessories -> Terminal $ sudo bash # wget -O - http://deb.opera.com/archive.key | sudo apt-key add - # apt-get update # apt-get upgrade # Ctrl-D $ Ctrl-D I Hope That Helps -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/707060 Title: update manager error messages -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
