Hello. I found the solution for my error: "after install nvidia driver and trying optirun glxspheres64 got: ERROR: ld.so: object 'libdlfaker.so' from LD_PRELOAD cannot be preloaded: ignored."
This error only on 64bit. Becouse if you try to open virtualgl_2.4_amd64.deb with archive manager - you will got an error. I386 and other opens successful.
So how to fix:
go to virtualgl website and get newest versing - 2.4.1. Install and be happy
link http://virtualgl.sourceforge.net/vgl.nightly/
