1) Only you can fix your system when you have done something to mess it up.
2) Not to expect other people to have a simple answer ready and waiting. Apparently it is often necessary to do just this:
3) Not to run an OS cleanup utility on a development branch because there are many libraries that need replacing but first the replacements have to be put in place. The cleanup utility took out those libraries but it was not capable of replacing them. Better to let Update Manager do it when it is ready to do it.Hours of googling, and typing hordes of random crap into terminal fixed the issue.
4) It is your choice to spend all those hours googling and typing random ****. Me? I would just install. It is a lot less painful and quicker.