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The X server cannot start because you have an error in xorg.conf. Please compare your configuration to the documentation.
If you do not find the cause you can show the xorg.conf here so we could have a look into it.
Can you check your X server is running with
ps -ef | grep X
If it is not running then you can check the Xorg.0.log.
If you have a GPU you can check if the driver is working well with
nvidia-smi
Seems this is the error that pops up in the log files:
230.917] (**) DUMMY(0): Default mode "320x175": 15.8 MHz, 37.9 kHz, 85.3 Hz (D)
[ 230.917] (II) DUMMY(0): Modeline "320x175"x85.3 15.75 320 336 368 416 175 191 192 222 doublescan +hsync -vsync (37.9 kHz d)
[ 230.917] (==) DUMMY(0): DPI set to (96, 96)
[ 230.917] (II) Loading sub module "fb"
[ 230.917] (II) LoadModule: "fb"
[ 230.917] (II) Module "fb" already built-in
[ 230.917] (II) Loading sub module "ramdac"
[ 230.917] (II) LoadModule: "ramdac"
[ 230.917] (II) Module "ramdac" already built-in
[ 230.917] (EE)
Fatal server error:
[ 230.917] (EE) AddScreen/ScreenInit failed for driver 0
[ 230.917] (EE)
[ 230.917] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 230.917] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 230.917] (EE)
[ 230.935] (EE) Server terminated with error (1). Closing log file.
It's not a GPU instance, so I've used X-dummy driver, following the instructions from the NICE DCV Administrator guide.
Hi, i also have the same error, and i've followed the official documentation . my instance type is "m5ad.2xlarge" , ubuntu 22.04 without a GPU attached. also it seems that Nice DCV display does not scale to screen size for instances without a GPU. any help with this is very much appreciated.
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So I actually had it figured out. I followed the configuration guidelines from the documentation to a tee, and had /etc/X11/xorg.conf with:
Reading this forum post (https://bbs.archlinux.org/viewtopic.php?id=264983) and removing the xorg.conf, it actually worked.