@george-spiggott I didn't know there was a Libretro version of pcsx2. I'm using the standalone version downloaded from the "experimental" section of retropie setup. Works great on my Linux Mint box. Just doesn't have support for CHD files. I'll keep my eye out for an lr version.
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first