I realize that the Defold devs are working on a 64-bit Linux version. But as that was mentioned months ago, I have no idea where they’re at with that now.
Installing the package TylerW recommended in that thread brought me from a Defold executable that’d do absolutely nothing (that I could tell), to being able to launch a splashscreen, but no application (not its GUI, anyway.) Plus, the error message said it wrote a log in /metadata/, but absolutely no file could be found there.
Sorry about the poor info on linux 64 bit support, it has caused a lot of confusion. We currently don’t support it, but people have been able to get it working anyway to various degrees. As far as I know, we are scheduled to support it in the next release, so probably next week or the week after.