Ubuntu 18 terminal not opening

I just installed Ubuntu 18 on my desktop PC alongside Windows 10 and have been using Ubuntu without any problems for a couple of days. Today, when I booted up my computer, I am no longer able to open the terminal at all. I've tried restarting it multiple times, but it still won't work. If I click the terminal icon on my task bar, nothing happens. If I try opening the terminal with CTRL+ALT+t, it still doesn't work.

How can I resolve this?

I had the same problem. After updating Python to version 3.7, some applications like Jupyter Notebook, Meld and the terminal, did not launch.

The problem was that the symbolic link to python3.4 was lost. Reinstalling python3-minimal solved it:

sudo apt-get --reinstall install python3-minimal

The same problem happened with me. The reason is that the python version is 3.7. You can download and say any terminal for solution. I used the terminal of visual code.

The code you need to enter is:

sudo update-alternatives --config python3

Then you should choose a version lower than python 3.7. I choose python3.6. So I write 1 and confirm.

If the problem persists, you can rewrite it.

Example: