Mint for years but i forget. In the updates make sure fully updated first. Then i remember some sort of upgrade command.

Im not much help but i think i did it once. Or you can preserve your home folder, broweser bookmarks, etc… the load the new os from scratch, but im sure theres an upgrade option.

libre office not being a smart arse either. it’s the easiest way. i am making some assumptions however. i assume you are a full on Linux user at home and have to deal with MS Office documents of various types at work or some other reason. you can work on that document at work un MS Office. bring it home and work on it some more in libre office. and back again.