For 1.38, the 18.04 build is reporting lower hashrate than the 20.04 build, is this normal?
the ubuntu 18.04 build is cuda 11.4.
The team black miner is optimized for cuda 11.5
Ubuntu 18.04 (2016) is not going to be supported next year, and is selected by the other mining softwares. A 5 year old ubuntu distribution can easily be hacked..
you can update HiveOS to the Nvidia version 495.46 which has CUDA 11.5 by adding in the latest drivers by using:
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt update
sudo apt upgrade
sudo apt install nvidia-driver-495