Comment 3 for bug 1898497

I had the same problem, but my log started like this:

Log time: 2020-10-21 09:38:03.264979
  MarkInstall python-is-python2:amd64 < none -> 2.7.17-4 @un uN Ib > FU=1
  Installing python2 as Depends of python-is-python2
    MarkInstall python2:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
    Installing python2-minimal as PreDepends of python2
      MarkInstall python2-minimal:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
       Removing: python-minimal
        MarkDelete python-minimal:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
    Installing libpython2-stdlib as Depends of python2
      MarkInstall libpython2-stdlib:amd64 < none -> 2.7.17-2ubuntu4 @un uN Ib > FU=0
       Removing: libpython-stdlib
        MarkDelete libpython-stdlib:amd64 < 2.7.15~rc1-1 @ii mK > FU=0
     Removing: python
      MarkDelete python:amd64 < 2.7.15~rc1-1 @ii mK Ib > FU=0
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) python-support:amd64 < 1.0.15 @ii mK Ib >
>>> Broken python-support <<<:amd64 Depends on python-minimal:amd64 < 2.7.15~rc1-1 @ii gR >

I've purged python-support, and solved the problem (i.e. it's installing now). It had only 6 packages depending on it.
From your log "nodejs" might be the problem, maybe a leftover from some ppa. Proceed with caution when removing python packages.
Best,
Daniel