无法从19.10升级到20.04 Focal Fossa

I was trying to upgrade my Ubuntu Studio to 20.04 following the official guide here https://help.ubuntu.com/community/FocalUpgrades/UbuntuStudio However when I get to the last step I reach an impass When I run pkexec update-manager I get this answer:

Unable to init server: Could not connect: Connection refused Unable to init server: Could not connect: Connection refused WARNING:root:can not import unity GI Namespace Dbusmenu not available Unable to init server: Could not connect: Connection refused (update-manager:8042): Gtk-WARNING **: 10:43:29.466: cannot open display:

And when I run sudo do-release-upgrade -m desktop it says that there's no new release found.

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