I downloaded GitKraken (gitkraken-amd64.tar.gz) from https://www.gitkraken.com/download, and unpacked it into /opt/gitkraken.
When I tried to run it, I got the following error...
error while loading shared libraries: libXss.so.1:
cannot open shared object file: No such file or directory
So apparently GitKraken is missing some libraries that it needs in order to run. A quick Google search turned up a fast way to install something that contains the missing library...
sudo dnf install libXScrnSaver
If you are running on Ubuntu or another Debian derivative, you can probably use...
sudo apt-get install libXScrnSaver
Now running ./gitkraken from /opt/gitkraken works. I submitted this to Axosoft as a bug, but I could be pursuaded to believe it isn't. Perhaps we all should have the libXScrnSaver installed by default? Maybe Linux users shouldn't expect software to simply install and run without the user having to navigate a maze of missing dependencies? Maybe my beard isn't long and gray enough to even use Linux?