This fixed my problem. I have successfully installed 20.04 LTS. Thanx!
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https://bugs.launchpad.net/bugs/1926669
Title:
20.04 LTS upgrade fails
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Public bug reported:
The error message doesn't say what went wrong, but fails to install the
20.04 LTS upgrade. The first time I tried to upgrade is had an error on
3rd party software so I disabled all 3rd party sources and tried again.
Still fails, but doesn't say why.
ProblemType: Bug
