In your xterm, please run:
sudo update-alternatives --config python3
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Ah finally. Thanks Aravisian!
I was hoping you could pitch in here.
It only shows python3.9
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sudo ln -sf /usr/bin/python3.9 /usr/bin/python3
The geniuses at Gnome symlinked the python version to gnome-terminal
I'm wobbbly... just woke up...
Ah, that what it was.
I really could not understand why Python broke the gnome-terminal. Now the whole thing started to make sense.
Now python is again configured with python3.9 which didn't work with the system apps.
It would break a lot of things. I remember when Trekker did this - and not long after, I did the same exact thing.
Is it possible to use the system apps with python3.9? If now I will reinstall linux.
Yes, you can.
In your xterm, can you now
cd /usr/bin
Then
sudo nano gnome-terminal
Right at the top, you will see
#!/usr/bin/python3
change to
#!/usr/bin/python3.9
save and exit... Then Log out and back in and please try ctrl+alt+t
It doesn't work.
My jaw physically dropped... That worked when it happened to me, even. And my mistakes are notoriously hard to fix.
When you did sudo update-alternatives --config python3 did you make any selection (Even if there was only one selection to make?
Yes. I made one. It did display two selections and both were python 3.9.6. Now if I run the command it gives an error which says the the linkgroup python3 is broken.
3.9.6
Okay. I'll try.
It still doesn't work.
I think the best thing would be to reinstall linux.
Ok, one more thing to try:
sudo apt reinstall python3 python3-minimal python3.8 python3.8-minimal
once done:
It works again! And the main menu too! Everything seems to work now! Thank you!
I had to help.
Seeing a person so distressed over being unable to access the Terminal...
you are my hero 
So now pyhon3 is linked to python3.8 which is required and I can still use python 3.9 with the command "pyhton3.9". Great!
I'm really thankful!