Note that the update function on CPAI 2.6.5 will fail. I had to go to the other URL, the one I posted, where I downloaded 2.8.0 and then installed that.
About your system, I am not familiar with Mint. Mine is running a very barebones Windows 10 with nothing else except BI and CPAI, a few utilities. No Office, no antivirus, etc. CPU is also very dependent on using substreams for the cameras, etc