Release 20.10 announced despite already running it

Ubuntu announces the 20.10 release, despite it running already. Probably related to some poor integration of *oem-release* (purged) or *oem-config* .

```
user@helmut-XPS-13-9310:~$ ssh helmut@192.168.0.3
Welcome to Ubuntu 20.10 (GNU/Linux 5.10.0-rc1+ x86_64)

 * Documentation: https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support: https://ubuntu.com/advantage

0 Aktualisierungen können sofort installiert werden.
0 dieser Aktualisierung sind Sicherheitsaktualisierungen.

New release '20.10' available.
Run 'do-release-upgrade' to upgrade to it.

Last login: Tue Oct 27 16:47:23 2020 from 192.168.0.7
user@helmut-XPS-13-9310:~$ more /etc/os-release
NAME="Ubuntu"
VERSION="20.10 (Groovy Gorilla)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.10"
VERSION_ID="20.10"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=groovy
UBUNTU_CODENAME=groovy