[petsc-dev] Configure won't find python

[Jed Brown]

Satish Balay <balay at mcs.anl.gov> writes:

> Sure - the initial premise of this thread [as I understood] was: /usr/bin/python is python2. On python3 only installs - there is no /usr/bin/python (for ex: jedbrown/mpich-ccache docker file) - so we need to fix this issue in configure.
>
> I'm guessing that most installs will have  /usr/bin/python as python2 or python3 - so missing /usr/bin/python is a smaller problem. Its not clear to me why this is missing in jedbrown/mpich-ccache - and how many OSes or distro will default to this mode.

On Debian and Ubuntu, /usr/bin/python is part of python2; it isn't created if you `apt install python3`.