Well for one I can tell you you are NOT on the release branch 
4.22.1-0+++UE4+Release-4.22 517 0
You are not on 4.26, which might actually be part of your issue as I do not think that version had the bundled toolchain. Also dos2unix is not needed for quite some time. Malloc error this early in the launch are also quite strange. Can you please post your specs?
And in any case, as convenient as the desktop files are I just do
Engine/Binaries/Linux/UE4Editor-Cmd
the -Cmd is not necessary as on Windows both UE4Editor and UE4Editor-Cmd do the same thing, but I still do it regardless