Currently all this extra touchscreen stuff is build as part of the image. I did rewrote some parts and transform this functionality into addon. Will take few days to test and then I will give you the addon.
I'm using Ubuntu 14.04.5 LTS but v16 is fine too (64 bit of course).
Great. Thanks for reporting back.
I mean I have to to make addon from this. Let me try in next days.
Can you try this version: LibreELEC.USB-SD.Creator.Linux-64bit.bin
There has been one bug regarding mmc devices which should be fixed.
Yes, you get something but at the same time you lose something 
I think the best approach would be to transform this functionality into proper addon. Then it could be installed from repository to get same functionality on all images. Will think of that.
Schorschi79, you need to be more explicit: which image did you use before and which are you using now?
This will be hard to crack.
Can you run app with --debug parameter and put result on pastebin.com? Start without sd card and then insert it when program already runs.
Can you also show me the partitions on this card? sudo fdisk -l /dev/sdX
And can you wipe sd card with sudo dd if=/dev/zero of=/dev/sdX bs=1M count=10 and then attaching it when program runs.
And can you try using this sd card with USB reader to see who is doing this problems (sd crd or reader).
And if you want I can build one special build for you with mode debug messages in. If you are interested...
Install addon from ZIP: kodi-theme-Estouchy-17.0-beta1-81d5d26.zip
I don't know about including in by default.
Kodi beta3 version: kodi-theme-Estouchy-17.0-beta3-7041777.zip
ls: /storage/.config/firmware/: No such file or directory
mkdir /storage/.config/firmware/
You could copied this file to /storage/.config/firmware/ without squashing.
It it possible to update to a newer version without loose my configuration and driver?
Save folder
/storage/.config/ts
- there are touchscreen related configuration files.
But you must update with a version which actually includes all this touchscreen stuff. Meaning not official image.
There is no need to format because we write complete disk image to a USB stick/SD card. Any data on a device is overwritten.
But you can use SDFormatter tool to remove both partitions and create only one big one when you don't need this device for libreelec.
You missed the fact that official images doesn't include all what is described in this thread. You need special image build by yourself or some other good guy. Ask in thread for a new image.
I don't think there was any changes in this area. Which touchscreen is this?
Evtest addon should be available as part of system-tools addon.
The question was about why Libreelec removed it?
Because libreelec extracts skin from kodi sources and use only Estuary.
I assume this skin is included only with Kodi itself. Because libreelec remove it then can't be installed from repository.
Did you tried to install my zip file manualy?
Update: Just tested this zip and skin works.
At the end I did managed to get arc function in work. Will try to reproduce your issue and if I can repeat that then I will also tried to fix it. If not it will stay as is.
Only Estuary skin is included by default.
You can try this Estouchy: kodi-theme-Estouchy-17.0-beta1-81d5d26.zip