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)