do-release-upgrade still doesn't work.
Workaround (the Debian way):
sed -i 's/bionic/focal/g' /etc/apt/sources.list
apt update
apt -y dist-upgrade
grub-install
... which works perfectly.
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** Attachment added: "apt.log from the most recent dist upgrade attempt"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1894967/+attachment/5408974/+files/apt.log
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** Attachment added: "the main log from the most recent dist upgrade attempt"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1894967/+attachment/5408975/+files/main.log
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** Attachment added: "/etc/apt tar ball with source.list and sources.list.d"
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1894967/+attachment/5408990/+files/apt.tgz
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