I changed Propmpt=noraml because of this:

:~$ do-release-upgrade 
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS development release 
set Prompt=normal in /etc/update-manager/release-upgrades.

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https://bugs.launchpad.net/bugs/1904408

Title:
  I tried do-release-upgrade, this error happened

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