I found the fix/solution; i tryed delete unknown screen(CRT-0) from
nvidia-settings but its shows "Failed to generate X config file!" and i checked
/etc/x11, xorg.conf was missing
So, i copied my 17.10 xorg.conf to 18.04 now its working i can see gdm greeter
Also, this line caught my attention(xorg.conf line:30)
Option "IgnoreDisplayDevices" "CRT"
~$ nvidia-settings
(nvidia-settings:18214): dbind-WARNING **: 23:26:48.227: Couldn't
register with accessibility bus: Did not receive a reply. Possible
causes include: the remote application did not send a reply, the message
bus security policy blocked the reply, the reply timeout expired, or the
network connection was broken.
** (nvidia-settings:18214): WARNING **: 23:26:48.468: PRIME: Failed to execute
child process “/usr/bin/prime-supported” (No such file or directory)
** Message: 23:26:48.468: PRIME: is it supported? no
WARNING: Unable to parse X.Org version string.
Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
ERROR: Unable to find a display device for screen 0!
ERROR: Failed to add X screen 0 to X config.
ERROR: Failed to add X screens to X config.
** Summary changed:
- nvidia detects 2 screen but there is no 2 screen
+ [xorg.conf missing]nvidia detects 2 screen but there is no 2 screen
** Also affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1762200
Title:
[xorg.conf missing]nvidia detects 2 screen but there is no 2 screen
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