According to VarLogDistupgradeMainlog.txt you don't have a desktop meta
package installed. Please try installing ubuntu-desktop and upgrading
again.
2020-07-13 21:07:16,923 DEBUG need_server_mode(): can not find a desktop
meta package or key deps, running in server mode
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1887426
Title:
"Error on do-release-upgrade -d 18.04 to 20.04 (mixed destop &
server)"
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