No display manager after Debian 12 installation on Hyper-V

I installed (graphical installation, selecting xfce) Debian 12 on Hyper-V Gen1 VM within Windows 10. When reboot Debian no login screen appears. What cause the problem that lightdm does not start? Same issue if I run Debian 12 live iso with different DEs. Go to text terminal alt+f1 and collect some information: $ sudo cat /etc/X11/default-display-manager /usr/sbin/lightdm $ systemctl status lightdm.service × lightdm.service - Light Display Manager Loaded: loaded (/lib/systemd/system/lightdm.service; enabled; preset: enabled) Active: failed (Result: exit-code) since Thu 2023-07-13 23:48:57 CEST; 22min ago Duration: 34ms Docs: man:lightdm(1) Main PID: 612 (code=exited, status=1/FAILURE) CPU: 36ms Warning: some journal files were not opened due to insufficient permissions. $ sudo lightdm --test-mode --debug [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log [+0.00s] DEBUG: Starting Light Display Manager 1.26.0, UID=0 PID=6878 [+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/01_debian.conf [+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf [+0.00s] DEBUG: Registered seat module local [+0.00s] DEBUG: Registered seat module xremote [+0.00s] DEBUG: Registered seat module unity [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager [+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ?gio-vfs? [+0.00s] DEBUG: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus Screen "Default Screen Section" (0) [ 6.525] (**) | |-->Monitor "" [ 6.525] (==) No monitor specified for screen "Default Screen Section". Using a default monitor configuration. [ 6.525] (==) Automatically adding devices [ 6.525] (==) Automatically enabling devices [ 6.525] (==) Automatically adding GPU devices [ 6.525] (==) Automatically binding GPU devices [ 6.525] (==) Max clients allowed: 256, resource mask: 0x1fffff [ 6.525] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist. [ 6.525] Entry deleted from font path. [ 6.525] (==) FontPath set to: /usr/share/fonts/X11/misc, /usr/share/fonts/X11/100dpi/:unscaled, /usr/share/fonts/X11/75dpi/:unscaled, /usr/share/fonts/X11/Type1, /usr/share/fonts/X11/100dpi, /usr/share/fonts/X11/75dpi, built-ins [ 6.525] (==) ModulePath set to "/usr/lib/xorg/modules" [ 6.525] (II) The server relies on udev to provide the list of input devices. If no devices become available, reconfigure udev or disable AutoAddDevices. [ 6.525] (II) Loader magic: 0x55f4a49d2f00 [ 6.525] (II) Module ABI versions: [ 6.525] X.Org ANSI C Emulation: 0.4 [ 6.525] X.Org Video Driver: 25.2 [ 6.525] X.Org XInput driver : 24.4 [ 6.525] X.Org Server Extension : 10.0 [ 6.526] (++) using VT number 7 [ 6.526] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration [ 6.527] (II) xfree86: Adding drm device (/dev/dri/card0) [ 6.527] (II) Platform probe for /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/5620e0c7-8062-4dce-aeb7-520c7ef76171/drm/card0 [ 6.531] (--) PCI:*(0@0:8:0) 1414:5353:0000:0000 rev 0, Mem @ 0xf8000000/67108864, BIOS @ 0x????????/131072 [ 6.531] (II) LoadModule: "glx" [ 6.532] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so [ 6.533] (II) Module glx: vendor="X.Org Foundation" [ 6.533] compiled for 1.21.1.7, module version = 1.0.0 [ 6.533] ABI class: X.Org Server Extension, version 10.0 [ 6.533] (==) Matched modesetting as autoconfigured driver 0 [ 6.533] (==) Matched fbdev as autoconfigured driver 1 [ 6.533] (==) Matched vesa as autoconfigured driver 2 [ 6.533] (==) Assigned the driver to the xf86ConfigLayout [ 6.533] (II) LoadModule: "modesetting" [ 6.533] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so [ 6.533] (II) Module modesetting: vendor="X.Org Foundation" [ 6.533] compiled for 1.21.1.7, module version = 1.21.1 [ 6.533] Module class: X.Org Video Driver [ 6.533] ABI class: X.Org Video Driver, version 25.2 [ 6.533] (II) LoadModule: "fbdev" [ 6.533] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so [ 6.533] (II) Module fbdev: vendor="X.Org Foundation" [ 6.533] compiled for 1.21.1.3, module version = 0.5.0 [ 6.533] Module class: X.Org Video Driver [ 6.533] ABI class: X.Org Video Driver, version 25.2 [ 6.533] (II) LoadModule: "vesa" [ 6.533] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so [ 6.533] (II) Module vesa: vendor="X.Org Foundation" [ 6.533] compiled for 1.21.1.3, module version = 2.5.0 [ 6.533] Module class: X.Org Video Driver [ 6.533] ABI class: X.Org Video Driver, version 25.2 [ 6.533] (II) modesetting: Driver for Modesetting Kernel Drivers: kms [ 6.534] (II) FBDEV: driver for framebuffer: fbdev [ 6.534] (II) VESA: driver for VESA chipsets: vesa [ 6.534] (WW) Falling back to old probe method for modesetting [ 6.535] (II) modeset(1): using default device [ 6.535] (II) Loading sub module "fbdevhw" [ 6.535] (II) LoadModule: "fbdevhw" [ 6.535] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 6.535] (II) Module fbdevhw: vendor="X.Org Foundation" [ 6.535] compiled for 1.21.1.7, module version = 0.0.2 [ 6.535] ABI class: X.Org Video Driver, version 25.2 [ 6.535] (EE) Unable to find a valid framebuffer device [ 6.535] (WW) Falling back to old probe method for fbdev [ 6.535] (II) Loading sub module "fbdevhw" [ 6.535] (II) LoadModule: "fbdevhw" [ 6.535] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 6.535] (II) Module fbdevhw: vendor="X.Org Foundation" [ 6.535] compiled for 1.21.1.7, module version = 0.0.2 [ 6.535] ABI class: X.Org Video Driver, version 25.2 [ 6.535] (II) FBDEV(3): using default device [ 6.535] vesa: Ignoring device with a bound kernel driver [ 6.536] (II) modeset(G0): using drv /dev/dri/card0 [ 6.536] (EE) Screen 0 deleted because of no matching config section. [ 6.536] (II) UnloadModule: "modesetting" [ 6.536] (EE) Screen 1 deleted because of no matching config section. [ 6.536] (II) UnloadModule: "fbdev" [ 6.536] (II) UnloadSubModule: "fbdevhw" [ 6.536] (EE) Screen 2 deleted because of no matching config section. [ 6.536] (II) UnloadModule: "vesa" [ 6.536] (EE) Fatal server error: [ 6.536] (EE) Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices [ 6.536] (EE) [ 6.536] (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. [ 6.536] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information. [ 6.536] (EE) [ 6.544] (EE) Server terminated with error (1). Closing log file. I also found this post, that describes same problem (but on Hyper-V Gen2 insted of Gen1) and suggest to install xf86-video-fbdev. I reinstalled the equivalent package for Debian and lightdm as well: sudo apt-get install --reinstall xserver-xorg-video-fbdev sudo apt-get install --reinstall lightdm If I'm not wrong it is called a greeter, the GUI that prompts the user for credentials. So I checked lightdm config: $ sudo lightdm --show-config [sudo] password for user: [Seat:*] A greeter-session=lightdm-greeter A greeter-hide-users=true A session-wrapper=/etc/X11/Xsession [LightDM] B logind-check-graphical=false Sources: A /usr/share/lightdm/lightdm.conf.d/01_debian.conf B /etc/lightdm/lightdm.conf Is lightdm-greeter a correct greeter? I ask because if I search for greeter I found lightdm-gtk-greeter, lightdm-deepin-greeter, lightdm-pantheon-greeter, lightdm-webkit2-greeter , etc. but no lightdm-greeter.