So i was having the “The system is running in low-graphics mode” problem which is decribed in this question. In order to solve it I proceeded as in the answers there.
I first tried:
sudo apt-get install --reinstall ubuntu-desktop sudo reboot
which didn't work.
After I went to the accepted answer which says to do:
sudo apt-get install fglrx for the user with an AMD graphic card (my case).
In order to check it, I rebooted the system. Now whenever I start linux either normally or
recovery mode -> failsafeX I don't get anymore the above mentioned error. It tries to load ubuntu (The screen get's purpleish) and before the screen with "Ubuntu" in the middle appears it goes black and freezes with an underscore in the upper left corner of the screen.
The effect is very similar to what I used to get before, when I had the error and I used to proceed with the steps ubuntu offered me, picking "Run with low-graphics mode for just one session" on this menu:
How can I fix the issue I am having?