The danger of hijacking other people's threads is people get confused. The OP had an RPi3 .. and you have different hardware.
In both cases the current Linuxserver container appears to be armv8/aarch64 only which means it will not run on any current LE release. It will run on the LE12 nightly for RPi2(3) boards as we switched to aarch64 there. It will not run on any Generic image which needs x86_64.
There are probably other container sources out there if you look for them.
thanks, I'll try to search for other containers (but till now - it does not look like LibreELEC is having a huge amount of documentation related to docker)
about hijacking threads - I'm used to asking in existing (similar) threads instead of creating new ones. On many forums the policy is to open new thread only if there is nothing similar to your problem.