Severe Graphical glitches after updating Ubuntu's packages using the Software Updater

Solution 1:

I think i've finally deciphered what was happening, my computer had the last amd gpu graphics that were unstable from ppa:oibaf/graphics-drivers, i've installed ppa-purge in my ubuntu system on which i've chrooted using the usb and then proceeded to use it on that PPA i've mentioned, it reverted everything i've installed in that ppa and deleted some packages, i've also deleted packages that weren't needed just in case with apt autoremove, this page gave me the idea and right after I saw the words "revert" and "packages", I knew that I was probably in a good path.

After unmounting and etc, I rebooted thinking that it wasn't gonna work but to my surprise everything booted as it should and there wasn't any TV static graphical glitches anymore.

Moral: Do not install experimental/unstable drivers, otherwhise things may happen one day and if you don't have an USB or CD, you're gonna regret it.