I’m finding instructions for UE4 and I see in the system requirements that Ubuntu 18.04+ is a requirement, but other than via Lutris I don’t see any way to install UE5. Please advise. Much appreciated.
other than Lutris , build from source is the only option that i know of
although you will need to ensure you have the latest graphics drivers and all the neded linux dependancies are installed
download the souce code .tar.gz from (you need an epic git account setup for the page to show )
https://github.com/EpicGames/UnrealEngine/releases/tag/5.0.0-release
documentation is provided there also on how to compile it
but its as follows (short form)
make a directory & extract the files to that directory
then on a command line do :-
cd /[the dir you extracted the files to ]
./Setup.sh
./GenerateProjectFiles.sh
make
cd/Engine/Binaries/Linux
./UnrealEditor
if all goes well job done and the editor will start up
( although it may/will take a few hrs to compile about 2 to 3 hrs in total )
if not its usualy because your missing a dependancy , so check the error message and find the lib you need to install and repeate the setup above till it finishes sucess
works ok for me ( opensuse tumbleweed ) although it did take me some time to find all the needed dependacies initaly (about a week )
Have Fun
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The link for downloading the source does not work. 
you need to signup and link your epic game account for it to work
see
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