@portobello, for specifying the classic interface, you don’t want to go back to the MyBinder site. Or at least don’t take what it makes without further editing. What that sie produces will now only send you to JupyterLab.
You want to hand-edit the URLs that produces now, if you are trying to launch with the classic interface.
For example, the one @minrk posted above works great to open in the classic notebook interface:
But you’ll see if you go to MyBinder.org now, and make one filling in the information related to that repo and that notebook:
It produces the following URL:
That though will now open in JupyterLab.
You can take what MyBinder.org gives you swap out
filepath=les_variables and replace it with
urlpath=%2Fnotebooks%2Fles_variables and you’ll have a link that will open that specific notebook with the classic interface. (Note, if you actually do the exercise, it should result in the link that I posted at the start of this post, & that is why I am not posting it again.)
You’ll do similar with links from MyBinder.org to your own notebooks, following that pattern.
If yours happen to be in root it is easier because you just replace
Feel free to specify a repo and notebook in a reply if you still are having trouble.
If you still want to use the
launch badges that MyBinder.org site produces yet send users to the classic notebook interface, you just need to edit them in a similar way after-the-fact.
As an aside to your ‘EDIT’:
If you have launched in JupyterLab yourself, you can opt to switch to classic via the upper menu bar ‘Help’ > ‘Launch Classic Notebook’.
You’ll see that it takes you to the classic Jupyter dashboard and
tree is at the end of the URL. For that direction, you don’t need to edit in
tree in the address bar yourself because a way is built into the upper menu bar.
If you are in the classic interface at the dashboard, you can edit the URL that ends in
/tree so that it ends in
/lab to switch to JupyterLab. There’s not a way presently built in for that direction from classic to lab interface.