When I started my system today wanted to fetch the latest updates. As I issued the command apt-get update my system halted and an error notification appeared. There was something of an Input/Output error and that the cache could not be read and something about unmet dependencies. Sorry, I was too late to take a screenshot.
Clearing the cache solved it. So if you encounter the same issue, you could do the following:
sudo rm /var/lib/apt/lists/* -vf
sudo apt-get update
sudo apt-get upgrade
Atleast, that solved my issue. Whatever caused the problem I do not know 