If you ever get a problem with your Linux,
DO NOT EVER try out an answer on any random forum without reading all the comments/replies.
The problem spreads like a freaking wildfire and you will end up reinstalling Linux and losing data what wasn't backed up. (If by God's grace, you do a regular back up)

yup yup. Sometimes when I'm on autopilot I actually try the approach of the OP on these forums. Needless to say I feel a little stupid afterwards.

If you do, Always keep the page open on phone. When shit hits the fan roll back manually what you did. 19/20 it isn't that big of a deal.

P.s.
Linux tip get comfortable breaking your os. Arch Linux is best learning platform imho with an excellent wiki. The installation alone teaches alot on how everything works.