The permissions on yuor sources.list are broken. I'm not sure how that could have happened, but could you try the following in a terminal please:
sudo chmod 644 /etc/apt/sources.list sudo chmod -R u+rw,go+r /etc/apt/sources.list.d sudo apt-get update That should restore permissions on these files to their defaults, and you should now be able to upgrade successfully. -- update manager crashes when attempting update https://bugs.launchpad.net/bugs/253518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
