Hi amigo!
I got it once running. And my computer is capable of it, on Windows works, even inside a VirtualBox 
I’ve got an i7-4770k, 8GB of RAM, and a Nvidia GTX 560Ti, I think I have the minimum requeriments covered.
The bad part is that I’m using Arch Linux, I built UE4Editor with my system and it hogged. Using the docker system I managed to build it, but it seems to not run fine.
I’ve read there’s some threading problems with Arch and is recommended to make UE4Editor-Linux-Debug, but with docker I gets some strange things.
With the following command fails because there’s no MAKE target.
And with this one builds Linux Native Dialogs but not the UE4Editor-Linux-Debug (take not of the quotation marks)
On the first one the log of LND is this:
And if I change the command to this one (putting make before the make tag):
The output of LND is the following:
If with my system I issue “make UE4Editor-Linux-Debug” starts building it.
BTW, going back to the original question… 
I guess that with the distribution package manager would download the launcher, and then like Steam for Linux does download all the stuff.