One way of manually expanding the current system partition is to use a tool called Gparted. You can create a Linux bootable USB stick and adjust your disk partitions with it.
I agree. If you can boot from an external device, Gparted is the right way to expand the partition.
Can you boot from an external device?
Or does the LibreELEC installer start, but shows an error when trying to install?
If the installer starts, what's the error message?
Thanks for the tip! Im looking through the options and don't see this function. I even put the skin back to stock to just in case there was a hidden menu I wasnt seeing. Is this an advanced feature?
Some PC's have two menus: One for general settings, and one for boot order. For my notebook, I have to hold F12 right after power-on. Your manual may give an advice, how to access the menu for boot order. It could be a different key for your HTPC.
Both times it wrote to the USB disk, and when i boot up the HTPC it just loads as normal, no clean install.
1. Stay calm.
2. Check the boot options of your HTPC. Maybe the boot order has to be changed. It should search for a bootable USB device at first place.
It seems much more sensitive than the Wi-Fi built in RPi3B+ as it finds many more local Wi-Fi routers. However when it switches to 5GHz the signal strength drops dramatically and the connection drops out after a few minutes. Although its better than the 5GHZ Wi-Fi in the RPi3 the 5GHZ signal strength in that particular location is just too low so will find another solution to get more speed at that location.
Interesting. So, receiving signals works fine, but sending signals fails. Because sending signals needs more wattage, it might be a PSU issue.
Copy and paste to Pastebin. Then post the generated link.
/bin/sh: 1: bc: not found
This means you have to install the package "bc". It could be hard, if you never compiled a driver module before. Anyway, you will find so much info about RPi, so it's possible even for a beginner.
Use the GUI: System -> LibreELEC -> System -> System Name
That's the hostname.
Finally. 
Please mark this thread as solved.
PS: You will need some fe-ma-le cables, too, to connect to GPIO: 40 fe-ma-le cables
(had to split a word, because it's censored - funny)
Yes already opened port 22 in my router but still doesn't work. Same result trying SSH tunnel..
Now I'm running out of ideas, too. 
You could go to a friend, and try to connect at his/here router setup.
You could join an internet security forum, and ask for SSH help there.
If nothing helps, buy a second RPi, if you only have one now.
are you suggesting pl 2023 chip?
please give me a link at least please.
This is what I bought at Amazon Germany: TTL-to-RS232 converter
Suddenly it's started to work :S, i am not sure what was the problem.
But most of the time i need to send same command few times to work.
See, that's why. You will have a stable connection, if you follow my suggestion.
Maybe the SSH port has been blocked somehow by your router. Check the port settings of your router.
And/or you can try SSH tunneling: SSH Tunnel with PuTTY
PS: I'm pretty sure it will work with a fresh image. A reason for broken SSH could be a LibreELEC update that doesn't update the SSH configuration correctly (maybe the root user ID changed in LibreELEC, but didn't changed at SSH configuration).
Again Connection refused :_(
Weird. I would reinstall LibreELEC by using a fresh SD card image.
Lets assume the static IP of your RPi is 192.168.0.5.
It's important that you are a "root" user if you try to connect. If you are not "root", then SSH will refuse the connection, because only "root" is defined for login by default. I had the same "issue" 
.
I bought a USB to RS232 converter to control my marantz amp via rpi3.
Don't do this. You will run into USB driver issues on RPi3. Use a TTL-to-RS232 converter (at GPIO RX/TX). It's cheap, and you will find a lot of manuals how to connect and test that converter. There are small versions that you can mount in your RPi3 case.
