"notebook" is not a recognized Jupyter subcommand?

Running 18.04 and the newest Lambda Stack.

Normally I set up conda environments and run everything from there, but this time I thought I’d see what’s available in a Quad from just the unadorned command line. Python3, import for tensorflow and torch all seem fine…let me try to open up a jupyter notebook and access it over the network…oops.

rh@lambda-quad:~$ jupyter notebook
Error executing Jupyter command ‘notebook’: [Errno 2] No such file or directory

Tried jupyter-notebook, and was prompted to run

sudo apt install jupyter-notebook

…but I’m more surprised that this would even be necessary – leading me to infer that it’s possible that the Lamba Stack install was incomplete.

Thought I’d check here before doing anything.