Hi Leon,
sorry for overlooking your previous post.
In your config.log you see

real_configure:40317: checking whether any of bzip2 liblzma libffi zlib is 
installed as or will be installed as SPKG
real_configure:40322: result: yes; install python3 as well

That is, one of system packages providing
bzip2 liblzma libffi zlib is missing.

One can find in config.log which one(s):

bzip2 is OK:
real_configure:17816: will use system package and not install SPKG bzip2

zlib is OK:
real_configure:14120: will use system package and not install SPKG zlib

but liblzma is not:
real_configure:35414: no suitable system package found for SPKG liblzma

and libffi is not:
real_configure:34155: no suitable system package found for SPKG libffi


You should install libffi-dev, xz-utils, and
liblzma-dev.

I.e. please run

sudo apt-get libffi-dev xz-utils liblzma-dev

and then re-try running /configure. Then your python3 is hopefully
recognsed.

Actually, we have an advice to use the list of packages to install for
Ubuntu/Debian, here:
https://sagemanifolds.obspm.fr/install_ubuntu.html

Please check that all these are installed.
(and if you get errors installing them, please report)

Best
Dima


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