How to connect three monitors on one computer dvi vga hdmi with Ubuntu?

Question

ubuntu

There is a video card with three dvi vga hdmi ports on Ubuntu 16.04
When all three are connected, the monitor falls off via VGA.
I activate it in the settings, I get the answer:

could not set the configuration for CRTC 81
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gsd_2drr_2derror_2dquark.Code2: could not set the configuration for CRTC 81

Answer 1

The vast majority, especially integrated ones, of video cards support only up to two outputs at the same time (see datasheets for the number of RAMDAC/TMDS/LVDS video cards). You will need an additional, discrete video card for one or two more outputs (monitors).