@Todor_Imreorov, @jakob.pogulis, same problem as you. When I “Build & Launch”, it writes the same error:
build and launch returns this error:
INFO:ENGINE: Defold Engine 1.2.76 (215b8a2)
FATAL:ENGINE: Could not open window (-2).
I noticed that if I “Bundle >> Linux Application”, and go in that directory, I’ll get two executables, one for 32 bits (foobar.x86) and one for 64 bits (foobar.x86_64). The 32 bits app works fine (window displays with content), but the 64 bits begins showing some window but for less than 1ms (can’t see anything) and then returns to shell, without any error message anywhere.
Maybe it’s related to the fact that it doesn’t work in the GUI also as I guess it tries to run the 64 bits version.
I couldn’t find anything for now about why the 64 bit app doesn’t start (it’s the empty project with just the Defold logo).