G'day William
It is possible I am giving you instructions for the wrong version of Linux Mint
To make certain of the version that you have, ...
Click on Menu
Then type in Welcome ....and then hit enter
This will open the Welcome Screen
In the bottom right hand corner it will say, Linux Mint ....and then it will say 20.3 or 19.1 or 20.1 or whatever version is yours.
Just type that info into your next reply.