Re: [SOLVED] (was: [downgrading to matlab 2019a and using 3.5 NOW does not work neither])

[Max Nikulin]

On 15/11/2021 20:31, Uwe Brauer wrote:
> Advice: don't try to upgrade python on a given Ubuntu distribution!!!!

Anover advice:
1. Avoid unsupported versions of software (Ubuntu-16.04 has only payed 
support for more than a year) and localize its usage if there is no 
other way.

> * reinstall jupyter
>
> #+begin_src
> sudo dpkg --purge python3-ptyprocess
> sudo -H pip3 install --upgrade --force-reinstall --no-cache-dir jupyter

2. Use venv (virtualenv for Python-2.7) to keep packages installed by 
pip isolated from system .deb's.

> I need still 2.7 to compile mercurial, since I rely on some extensions
> for mercurial that do not work under 3.X

Ubuntu-20.04 has (already unsupported) Python-2.7 in addition to 3.8 and 
3.9.

It is better to keep primary system up to date and to use containers 
(LXC, docker, etc.) or fully virtualized systems for special needs.