Try installing python3.8-distutils. 

On Monday, September 21, 2020 at 8:35:00 AM UTC-7 Sébastien Labbé wrote:

>
> > > 
>> -----------------------------------------------------------------------------
>>  
>>
>> > > 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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