If you have upgrade set to automatic you will be prompted if you want to update.
To "force" go to Settings --> LibreELEC -- Updates and check update channel is on 9. Available versions should show 9.2.1.
All settings *should* be preserved but to be *safe* don't shake hands, keep 6ft away and make a backup via the LE settings page.
Whilst we have many German and multilingual users, this is an English only forum. Please use an online translator if you're unable to post in English.
Ubuntu will be able to read the SD card. You need to look on the 2nd partition labelled STORAGE. Go to /storage/.kodi.temp and you will find the log file there.
Otherwise (Assuming you don't have an internet connection on the RPi4) download the zip from Here and install it. Or from the addons if you do.
If you do have access to the network, use SSH and access it that way.
My initial thought is that some skins are not setup or translated for the Greek language.
If everything works well with the default skin (Estuary) then you will need to contact the maintainers of the failing skins - and/or by assisting in translating.
Hmm, looks like there may be an error.
Try cp rclone-current-linux-xxxx/rclone /storage/bin
I've changed the original
Generally a kodi.log will give the most information:
Otherwise - start from a "new" image and install your add-ons one at a time.
service.kn.switchtimer is an unknown - so look here first.
Netdata seems to do exactly the same, and is already implemented as a docker image.
As far as I know, LE is not working on anything like this. OSMC however is. Whilst it is still in the development stage it is hoped to be released soon. Probably with the next release of Kodi - but don't quote me 
Try swapping the HDMI connectors around, Projector support is limited.
Did you follow the guide in the Wiki or just work it out for yourself?
I'm not a user of either but doing a search of the forums (always a good idea) boblight has not been updated since 2017 (Not always a bad thing) but hyperion seems to be the way to go.
As with most things - give both a go and see what "floats your boat"
This should help kodi-19-for-s9xxx
Please use a separate thread for each issue.
1) As far as I know - there is no way to delete the content. Even if you could, if could still be available *somewhere*
2) which <name> will find executables in your $PATH, otherwise use the find command
3) Add your comment to the posted URL including the URL output of cat /storage/.kodi.temp/kodi.log | paste
Nightlies by their virtue do not always include fully functioning add-ons (or anything for that matter)
My guess would be that a docker add-on is not a top priority,
You'd be better off asking on the OSMC forum, as there will be more Vero and RPi users.
It does answer your question.
So "what is your question?" check your thread title.
There are *too* many options. Use a search engine for each requirement.
1) Multiple HDD will need an external powered hub. So 4 fails.
2) UPS: Many options available but not sure if any offer "full" UPS shutdown in the event of power outage under LE.
3) Loads available - but you'll need to ensure they work under LE
4) No chance.... See 1
So it's mounted as "scsi" which is why eject -s works
