Trying to do a release upgrade on Ubuntu 14.04 with:
I get the following error:
It was not possible to authenticate some packages. This may be a transient network problem. You may want to try again later. See below for a list of unauthenticated packages. libxkbcommon-x11-0
What is this about? I did
sudo apt-get update && sudo apt-get dist-upgrade
before and deactivated all ppas. What else could I do?