You cannot upgrade because you have 3rd party PPA's installed. Try removing 
them before upgrading:
sudo apt-get install ppa-purge
sudo ppa-purge ppa:oibaf/graphics-drivers
sudo ppa-purge ppa:graphics-drivers/ppa

Let us know if the upgrade works then.
The freezing is a completely different issue.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1911355

Title:
  Dosent let me update to version 20. and sometimes it goes to intrafms
  and asks for a fsck

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