This is because you are using an unofficial mirror of the Ubuntu
archive. Try running "RELEASE_UPGRADER_ALLOW_THIRD_PARTY=1 do-release-
upgrade -d" and see if that allows you to proceed with the upgrade.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1848909
Title:
Cannot upgrade from Ubuntu 19.04 to 19.10
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