If you are seeing all the weird and unreadable characters, it is likely that you have accidentally changed the Language, and your computer is unable to display it properly to you, or you are unable to understand what language it is.
Fear not, you can simply change it back to English by following the steps below.
First, you should still recognize where’s the main menu despite that you are uncertain which button to click.
Look for the item that has a bracket (V),
click on it and hover to Languages,
then choose English.
You will be prompted to restart the temrinal,
click the button on the left to restart now.
After the terminal restart by itself, you should now see everything back to English.