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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