I fixed by myself:
removed old java8 oracle package and old php7.0 installed from the disabled
third parties repo.
After that upgrade run without problem
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1875023
Title:
Can't upgrade from Ubuntu Server 18.04.4 LTS to 20.04 LTS
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