sage -pip not working on debian

[zerline]

Testing sage_sample installation on debian, with the debian package (sagemath:amd64 8.6-5 )

$ sage -sh
(sage-sh) odile@cecile:sage_sample$ sage -pip install --upgrade --no-index -v .
sage-run received unknown option: -pip
usage: sage [options]
Try 'sage -h' for more information.

So I had to do:

$ sage -python2 -m pip install --upgrade --no-index -v .

(which btw is not really documented)

[goebbe]

Thank you! This was very helpful. :-)
I struggled to install jupyterlab inside sage on Linux Mint 20.0. (which is base on Ubuntu 20.04) and had a similar problem.
Python 2 ist not included in Ubuntu and sagemath is sagemath9.0-1ubuntu4

The solution was:
sage -python3 -m pip install jupyterlab

Then I coul start sage with jupyterlab:
sage -n jupyterlab