Just restore from the backup you made prior to the do-release-upgrade run. Systems with lots of non-Canonical packages and many PPAs installed often have failed upgrades. Best to use your backup/restore methods to just handle the data parts after doing a fresh install of the new OS. 20.04.1 has been released.
Code:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Codename: focal
I didn't do anything special to get it beside my standard weekly apt full-upgrade patching.
If your backups are all-or-nothing, perhaps better backups are needed?
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