I did several "sudo apt remove blabla "  step by step 
for several programs that I had added from software deposits outside Ubuntu's
and then at some point I was able to do the full upgrade to Ubuntu 20.04.1.
I will decide carefully what I reinstall

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https://bugs.launchpad.net/bugs/1897724

Title:
  unsuccessfull release-upgrade to ubuntu 20.04.1

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