Typo3 11.x LTS migration from openSUSE to Ubuntu incl. Typo3 installation und page migration / Lets Encrypt

- Versions: Typo3 11 LTS, openSuSe - latest, ubuntu - latest
- Tasks: install Typo3 on Ubuntu -> migration of the webpages incl. extensions OpenSuse based to Ubuntu -> lets encrypt install + setup for all pages

we want to migrate these websites:
https://www.scngmbh.at
https://www.scngmbh.ch
https://www.scngmbh.de
https://www.seminar-experts.at
https://www.seminar-experts.ch
https://www.seminar-experts.de
https://www.networkuniversity.at
https://www.networkuniversity.ch
https://www.networkuniversity.de
https://www.sysknowledge.at
https://www.sysknowledge.ch
https://www.sysknowledge.de
https://www.s-r-i.org