How to make the terminal work again?

Question

linux

I recently installed python 3 on Linux Mint (maybe I messed up something in the bush). The next day, programs such as terminal, program manager, system settings, system reports (and much more from administration) stopped working. When you try to install another OS, a window appears with the announcement "Error dismounting the file system" (udisks-error-quark, 14). I don't know what to do now, please help.

Answer 1

Demolish the system and reinstall.
I'm serious. It will be easier than figuring it out. Moreover, modern "friendly" systems - they are worse than Windows stupefy.

Answer 2

undo the changes?

Answer 3

I guess what happened - during the installation, some libraries were needed that conflict with the current ones in the system. And then - either they themselves agreed, or the package manager did something there (although it is not indicated how they installed it?), And some of the libraries were either removed or replaced with other versions.
To find out what the program is missing to run, run it through the terminal. Because the "terminal" program or whatever it is called in mint, in sneakers it's Konsole, somewhere it's called Terminal, it doesn't matter - if it doesn't start, then it's easier to start by pressing Ctrl+Alt+F1(F1...F7), there there will be a pure terminal that does not need a GUI at all. Well, there we try to run the program, and look at what swears. Well, export DISPLAY=0.0 before the program name, if this works in mint (it doesn’t work in my mageia7). There is further exhaust with errors you need to look.
In general, in Linux, this is how we install programs through the package manager from native repositories. If you added your own - you will have to sort out the problems, if you installed from the source - again, you will have to look for each file where it was installed and if you overwrote something, restore it.
But it's easier to back up more often, of course.

Answer 4

what is equal to PATH?
echo $PATH