Parsec officially supports Ubuntu 18.04 LTS. Install it from our downloads page.
Parsec will run with hardware accelerated decoding on Intel HD Graphics by default.
AMD and Nvidia cards need to have a VAAPI-VDPAU wrapper setup, which most systems have by default. You may need to set your your libva to use it with
export LIBVA_DRIVER_NAME=vdpau. You can use
vainfo to verify that your system has hardware decoding enabled.
Alternatively, you can switch to the Intel hardware accelerated decoding if you switch Intel to your primary device. For all hardware, please use the newest drivers. For instance, you will need Nvidia driver 375.39 or greater.