Recently ran into this lovely message:

root@g73sw01:~#
root@g73sw01:~# systemctl status gdm3 -l
? gdm.service – GNOME Display Manager
Loaded: loaded (/usr/lib/systemd/system/gdm.service; static)
Active: active (running) since Sat 2024-09-14 14:42:24 EDT; 1 day 21h ago
Main PID: 3254 (gdm3)
Tasks: 4 (limit: 19063)
Memory: 5.7M (peak: 50.2M)
CPU: 2.239s
CGroup: /system.slice/gdm.service
??3254 /usr/sbin/gdm3

Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: pam_unix(gdm-password:auth): authentication failure; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rh>
Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: pam_sss(gdm-password:auth): authentication success; logname= uid=0 euid=0 tty=/dev/tty1 ruser= rho>
Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: gkr-pam: unable to locate daemon control file
Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: gkr-pam: stashed password to try later in open session
Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: pam_unix(gdm-password:session): session opened for user tom@mds.xyz(uid=155601104) by tom@mds.xyz(>
Sep 16 11:52:32 g73sw01.nix.mds.xyz gdm-password][736096]: gkr-pam: unlocked login keyring
Sep 16 11:52:37 g73sw01.nix.mds.xyz gdm3[736955]: modprobe: FATAL: Module nvidia not found in directory /lib/modules/6.8.0-44-generic
Sep 16 11:52:48 g73sw01.nix.mds.xyz gdm3[737640]: modprobe: FATAL: Module nvidia not found in directory /lib/modules/6.8.0-44-generic
Sep 16 11:52:58 g73sw01.nix.mds.xyz gdm3[3254]: Gdm: Child process -39565 was already dead.
Sep 16 11:52:58 g73sw01.nix.mds.xyz gdm3[737891]: modprobe: FATAL: Module nvidia not found in directory /lib/modules/6.8.0-44-generic
root@g73sw01:~#

and also this one on XRDP and RDP attempts:

xrdp-sesman.log:[2024-09-14T13:10:14.437-0400] [ERROR] waitforx: Unable to find any RandR outputs

as well as this one in one of the /var/log/ log files:

can’t open /sys/module/nvidia/version
can’t access /run/u-d-c-nvidia-drm-was-loaded file

To begin addressing these, issue the following:

apt install linux-modules-nvidia

followed by installing the latest version:

apt install linux-objects-nvidia-550-server-open-6.8.0-44-lowlatency

this installed something.  But the command:

ubuntu-drivers list

still showed nothing.  And I do have Proprietary drivers for devices(restricted) is also checked in Software & Updates under Ubuntu Software.  So let’s try to install the open kernel package:

apt install nvidia-driver-550-open

and check if that worked:

ubuntu-drivers list

but nothing shows up.  Time for a reboot.  Testing with nvidia-smi reveals we need to:

root@g73sw01:~# nvidia-smi
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

root@g73sw01:~#

But this quickly turned into a struggle.  Even in single user mode, the following was printed and made it difficult to get a prompt:

NVRM: The NVIDIA GPU 0000:01:00.0 (PCI ID: 10de:0dd1)
NVRM: installed in this system is not spported by open nvidia.ko because it does not include the required GPU
NVRM: System Processor (GSP)
NVRM: Please see the ‘Open Linux Kernel Modules’ and ‘GSP Firmware’ sections in the driver README, available on
NVRM: the Linux graphics driver download page at www.nvidia.com.
nvidia: probe of 0000:01:00.0 failed with error -1
NVRM: The NVIDIA probe routine failed for 1 device(s)
NVRM: None of the NVIDIA devices were initialized.

Got X startup issues so neither NoMachine nor XRDP worked:

ERROR: apport (pid 24951) 2024-09-16 14:46:59,145: report /var/crash/_usr_bin_ibus-daemon.155601104.crash already exists and unseen, skipping to avoid disk usage DoS

Eventually, ended up in this state and with these packages:

libnvidia-cfg1-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-common-470/noble-updates,noble-updates,noble-security,noble-security,now 470.256.02-0ubuntu0.24.04.1 all [installed,auto-removable]
libnvidia-compute-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,automatic]
libnvidia-compute-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
libnvidia-decode-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-decode-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
libnvidia-egl-wayland1/noble,now 1:1.1.13-1build1 amd64 [installed,auto-removable]
libnvidia-encode-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-encode-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
libnvidia-extra-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-fbc1-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-fbc1-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
libnvidia-gl-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-gl-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
libnvidia-ifr1-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
libnvidia-ifr1-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 i386 [installed,auto-removable]
linux-modules-nvidia-550-6.8.0-44-generic/noble-updates,noble-security,now 6.8.0-44.44+1 amd64 [installed]
linux-objects-nvidia-470-6.8.0-1005-oem/noble,now 6.8.0-1005.5 amd64 [installed,automatic]
linux-objects-nvidia-550-6.8.0-44-generic/noble-updates,noble-security,now 6.8.0-44.44+1 amd64 [installed,automatic]
linux-objects-nvidia-550-server-open-6.8.0-44-lowlatency/noble-updates,noble-security,now 6.8.0-44.44.1+1 amd64 [installed]
linux-signatures-nvidia-6.8.0-1005-oem/noble,now 6.8.0-1005.5 amd64 [installed,automatic]
linux-signatures-nvidia-6.8.0-44-generic/noble-updates,noble-security,now 6.8.0-44.44+1 amd64 [installed,automatic]
nvidia-compute-utils-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
nvidia-firmware-550-550.107.02/noble-updates,noble-security,now 550.107.02-0ubuntu0.24.04.1 amd64 [installed,automatic]
nvidia-kernel-common-550/noble-updates,noble-security,now 550.107.02-0ubuntu0.24.04.1 amd64 [installed,automatic]
nvidia-kernel-source-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
nvidia-prime/noble,noble,now 0.8.17.2 all [installed]
nvidia-settings/noble,now 510.47.03-0ubuntu4 amd64 [installed]
nvidia-utils-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]
xserver-xorg-video-nvidia-470/noble-updates,noble-security,now 470.256.02-0ubuntu0.24.04.1 amd64 [installed,auto-removable]

via these commands:

apt install linux-modules-nvidia-550-$(uname -r)
apt install linux-modules-nvidia-470-6.8.0-1005-oem

and upon reboot, no boot specific issues, yet.  Naturally made use of:

https://ubuntu.com/server/docs/nvidia-drivers-installation

After a few combinations of xrdp and xorgxrdp, finally logged in with only these errors printed:

[20240916-16:22:26] [ERROR] SSL_read: I/O error
[20240916-16:22:26] [ERROR] libxrdp_force_read: header read error
[20240916-16:22:26] [ERROR] Processing [ITU-T T.125] Connect-Initial failed
[20240916-16:22:26] [ERROR] [MCS Connection Sequence] receive connection request failed
[20240916-16:22:26] [ERROR] xrdp_sec_incoming: xrdp_mcs_incoming failed
[20240916-16:22:26] [ERROR] xrdp_rdp_incoming: xrdp_sec_incoming failed
[20240916-16:22:26] [ERROR] xrdp_process_main_loop: libxrdp_process_incoming failed
[20240916-16:22:26] [ERROR] xrdp_iso_send: trans_write_copy_s failed
[20240916-16:22:26] [ERROR] Sending [ITU T.125] DisconnectProviderUltimatum failed

This is the combination that works for both Kerberos/LDAP authenticated users and locally authenticated users:

xorgxrdp/noble,now 1:0.9.19-1 amd64 [installed]
xrdp/noble,now 0.9.24-4 amd64 [installed]

But when using:

xrdp_0.10.1-2_amd64.deb

we get the original error.

xrdp-sesman.log:[2024-09-14T13:10:14.437-0400] [ERROR] waitforx: Unable to find any RandR outputs

Now let’s try compiling from source.  Both XRDP and XORGXRDP from their GitHub repos and off the main branch:

root@g73sw01:/etc/X11# cat /etc/xrdp/sesman.ini|grep param
; Session definitions – startup command-line parameters for each session type
; Fedora 26 or later : param=/usr/libexec/Xorg
; Debian 9 or later : param=/usr/lib/xorg/Xorg
; Ubuntu 16.04 or later : param=/usr/lib/xorg/Xorg
; Arch Linux : param=/usr/lib/Xorg
; CentOS 7 : param=/usr/bin/Xorg or param=Xorg
; CentOS 8 : param=/usr/libexec/Xorg
; FreeBSD (from 2022Q4) : param=/usr/local/libexec/Xorg
; param=Xorg
param=/usr/lib/xorg/Xorg

A parameter change that was needed is above, but otherwise worked for at least the local users.  A session example:

[tom@mds.xyz@g73sw01:~] :)[U]$ /usr/lib/xorg/Xorg :11 -auth .Xauthority -config xrdp/xorg.conf -noreset -nolisten tcp -logfile .xorgxrdp.%s.log

X.Org X Server 1.21.1.11
X Protocol Version 11, Revision 0
Current Operating System: Linux g73sw01.nix.mds.xyz 6.8.0-1005-oem #5-Ubuntu SMP PREEMPT_DYNAMIC Sat Apr 20 01:33:14 UTC 2024 x86_64
Kernel command line: BOOT_IMAGE=/BOOT/ubuntu_6ywjpk@/vmlinuz-6.8.0-1005-oem root=ZFS=rpool/ROOT/ubuntu_6ywjpk ro quiet splash vt.handoff=1
xorg-server 2:21.1.12-1ubuntu1 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.42.2
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (–) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(++) Log file: “.xorgxrdp.11.log”, Time: Tue Sep 17 00:52:18 2024
(++) Using config file: “/etc/X11/xrdp/xorg.conf”
(==) Using system config directory “/usr/share/X11/xorg.conf.d”
xorgxrdpSetup:
xrdpdevSetup:
rdpmousePlug:
rdpkeybPlug:
rdpIdentify:
rdpDriverFunc: op 10
rdpProbe:
rdpPreInit:
rdpScreenInit: virtualX 800 virtualY 600 rgbBits 8 depth 24
rdpScreenInit: pfbMemory bytes 1920000
rdpScreenInit: pfbMemory 0x7f6d00924010
rdpSimdInit: assigning yuv functions
rdpSimdInit: cpuid ax 1 cx 0 return ax 0x000206a7 bx 0x03100800 cx 0x1fbae3bf dx 0xbfebfbff
rdpSimdInit: sse2 amd64 yuv functions assigned
rdpClientConInit: disconnect idle session after [0] sec
rdpClientConInit: kill disconnected [0] timeout [0] sec
rdpXvInit: depth 24
rdpScreenInit: out
rdpCreateScreenResources:
rdpmousePreInit: drv 0x6351a97a2c90 info 0x6351a9a814f0, flags 0x0
rdpmouseControl: what 0
rdpmouseDeviceInit:
rdpmouseCtrl:
rdpRegisterInputCallback: type 1 proc 0x7f6d019c2610
rdpmouseControl: what 1
rdpmouseDeviceOn:
rdpkeybPreInit: drv 0x6351a97a2c40 info 0x6351a9a85040, flags 0x0
rdpkeybControl: what 0
rdpLoadLayout: rules=”evdev” model=”pc104″ variant=””layout=”us” options=””
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Could not resolve keysym XF86CameraAccessEnable
> Warning: Could not resolve keysym XF86CameraAccessDisable
> Warning: Could not resolve keysym XF86CameraAccessToggle
> Warning: Could not resolve keysym XF86NextElement
> Warning: Could not resolve keysym XF86PreviousElement
> Warning: Could not resolve keysym XF86AutopilotEngageToggle
> Warning: Could not resolve keysym XF86MarkWaypoint
> Warning: Could not resolve keysym XF86Sos
> Warning: Could not resolve keysym XF86NavChart
> Warning: Could not resolve keysym XF86FishingChart
> Warning: Could not resolve keysym XF86SingleRangeRadar
> Warning: Could not resolve keysym XF86DualRangeRadar
> Warning: Could not resolve keysym XF86RadarOverlay
> Warning: Could not resolve keysym XF86TraditionalSonar
> Warning: Could not resolve keysym XF86ClearvuSonar
> Warning: Could not resolve keysym XF86SidevuSonar
> Warning: Could not resolve keysym XF86NavInfo
Errors from xkbcomp are not fatal to the X server
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat on
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat on
rdpRegisterInputCallback: type 0 proc 0x7f6d00e27940
rdpkeybControl: what 1
rdpkeybDeviceOn:
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat on
rdpDeferredRandR:
rdpResizeSession: width 1024 height 768
calling RRScreenSizeSet
rdpRRScreenSetSize: width 1024 height 768 mmWidth 271 mmHeight 203
rdpRRGetInfo:
screen resized to 1024×768
RRScreenSizeSet ok 1
rdpRRSetRdpOutputs: numCrtcs 0 numOutputs 0 monitorCount 0
rdpRRSetRdpOutputs: update output 0 left 0 top 0 width 1024 height 768
rdpRRConnectOutput:
rdpInDeferredRepeatCallback:
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat off
rdpInDeferredRepeatCallback:
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat off
rdpInDeferredRepeatCallback:
rdpkeybChangeKeyboardControl:
rdpkeybChangeKeyboardControl: autoRepeat off

Cheers,
HTH