nvm ls does not list specific installed version numbers

I recently ran an npm update that broke my Vue app. As a result, I am trying to revert my server to the previous version of Node/npm that it was using.

However, when I run nvm ls I get the following output in the terminal.

->       systemiojs -> N/A (default)node -> stable (-> N/A) (default)unstable -> N/A (default)

It doesn't give a list of installed versions to try. If anyone can tell me how to get around this I'd much appreciate it.

The question has been asked before but has not been adequately answered.

I am using Ubuntu 21.04.

Thanks!