alt+F2 and then
gksu nautilus to change permissions in some root folders. That was at least the goal. Even after opening Nautilus as root I wasn't able to change the permissions so I decided to simply do my thing (which was copying some (hundreds) of fonts I had to the font folder in the system) which I did but there was an error in the process, nautilus crashed. I couldn't open it again the same way as I did before and when I opened the font folder I didn't have a permission to delete anything so I couldn't even take those fonts out. I restarted my computer but it still didn't work. What's even more dramatic, when I opened mozilla to write here I discovered that some websites (like facebook for instance) are without text now. Probably because of those fonts that I shouldn't have been even touching in the first place.
I guess I really mucked up this time but what can I do in this situation? Is there any other way to get the root privileges?