Hello, > What video device does your VM use? Maybe it uses real hardware, or does it use a virtual device like QLX or Virtio? I have been using virtio. I also tried QLX and it works. It is the qemu vga driver. I already tried qemu virtio and qemu vmware drivers, they have the same problem as the vga driver: No sddm GUI login screen. > > I can now tell that the problem is introduced when upgrading the > > following packages from bullseye to their bookworm versions: > > Did you upgrade your full distribution or only these files? > > I would never consider using packages from a different Debian version. I guess people do this? But liking stability, it is not something I would do. Normally, I also do not do that. As I wrote, the GUI login was shown in a bullseye VM (no packages from other origins), but it is not shown in a bookworm VM (no packages from other origins). So, I upgraded a bullseye VM step by step to find out where exactly the problem is and I can tell now, that before upgrading libglx-mesa0 libx11-xcb1 libgbm1 libgl1-mesa-dri libdrm-common libglapi-mesa libdrm-amdgpu1 libdrm2 libegl-mesa0 libx11-6 libwayland-client0 > the GUI login was shown and after upgrading these packages, the GUI login was not shown. > I did a test, building a Bullseye VM and then totally upgrading to > Bookworm and had no issues. The same result for me after directly installing bookworm with virt- manager. Obviously, there is a significant difference between a VM in OpenNebula and a VM with the same software in virt-manager ... Regards Christoph
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