What else have you tried?
What changed on your system?
What were you doing before? Or what do you expect to do normally to open JupyterLab?
That last question was what @krassowski may have been asking with:
A lot of us work on remote machine machines that have more power than a local machine and allow us to do things more reproducibly than the current machine we may have in our hands at the time. So we don’t necessarily know what the local user expects. In other words, putting the link in the browser is generally how we do it. I know others use Anaconda navigator and can kick off Jupyter that way. And so with various routes possible, we aren’t necessarily following what you may be doing and expect to happen?
Have you worked through the discussion about having the browser open Jupyter here?