Hello, > 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. I can now tell that the problem is introduced when upgrading the following packages from bullseye to their bookworm versions: libglx-mesa0 libx11-xcb1 libgbm1 libgl1-mesa-dri libdrm-common libglapi-mesa libdrm-amdgpu1 libdrm2 libegl-mesa0 libx11-6 libwayland-client0 Regards Christoph
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