This is https://github.com/sagemath/binary-pkg/issues/28

On Monday, August 23, 2021 at 6:15:51 AM UTC-7 [email protected] wrote:

> Hi all,
>
> I've just noticed that when running ./sage immediately after unpacking 
> sage-9.3-Ubuntu_20.04-x86_64.tar.bz2 on a freshly installed Ubuntu 20.04.2 
> system, one gets the error message
>
> /usr/bin/python: not found
>
> The issue is immediately fixed by installing the Ubuntu package 
> python-is-python3, which simply provides a symlink from /usr/bin/python to 
> /usr/bin/python3.
> Since the package python-is-python3 is not installed by default in Ubuntu 
> 20.04, this certainly perturb new users. 
>
> Could this be fixed when preparing the Ubuntu binaries for Sage 9.4 ? 
> If not, python-is-python3 should be mentioned as a prerequisite for 
> installing Sage binary on the download page. 
>
> Eric.
>

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