> > 
> ----------------------------------------------------------------------------- 
>
> > > Checking whether SageMath should install SPKG python3... 
> > > checking whether any of sqlite libpng bzip2 xz libffi is installed as 
> or will be installed as SPKG... no 
> > > checking for python3 >= 3.7, < 3.9 with modules sqlite3, ctypes, math, 
> hashlib, crypt, readline, socket, zlib, distutils.core... 
> > > checking ... whether /usr/bin/python3.8 is good... no, the version is 
> in the supported range, and the modules can be imported, but distutils 
> cannot build a C extension 
> > > checking ... whether /usr/bin/python3 is good... no, Python 3.6.9 is 
> too old 
> > 
> > try 
> > https://trac.sagemath.org/ticket/30053 
> > which bans 3.6. 
>

Actually, the above is obtained with the branch #30053. Otherwise, system 
python 3.6 is chosen.
 

>
> you might need to 
>
> apt install python3-distutils 
>

As I wrote, this is was I did. It says it is already the most recent 
version (3.6.9-1~18.04) which is installed, which seems to mean that it is 
distutils for system python 3.6 not 3.8.
 

>
> and then 
>
> ./configure PYTHON3=/usr/bin/python3.8 
>

I can try that, but I think it will not work since "distutils cannot build 
a C extension" in my system python 3.8.

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