Hello, I use the cloud solution OpenNebula to manage VMs in a cloud. There I have several VMs with Debian 11 running successfully, sddm, lightdm and gdm3 are installed as display managers. When I choose one of them, the corresponding GUI login is displayed in the VNC display of the VM.
However, after installing a VM with Debian 12, none of these three display managers shows its GUI login screen after boot. With sddm it is noticeable that the process sddm-helper crashes shortly after it is started. To get to the bottom of the problem, I upgraded a bullseye VM to a bookworm VM step by step: first libc, then the Xorg- packages, then the kernel, then sddm, lightdm and gdm3, and finally the rest. Unfortunately, it was only after the rest that the GUI login no longer appeared; therefore I am not really any further with the answer to the question what exactly the problem is. No matter what I tell qemu what video driver to use (cirrus, vga, vmvga, virtio), the problem occurs with all of them. On a real hardware the graphical login is displayed, with the same software packages. Can anyone help? Regards Christoph
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