Thanks, that log is good. The only real error I can see is that your GPU doesn't support some feature gnome-shell is trying to use:
Jan 21 10:25:58 HackBook gnome-shell[1919]: Shader compilation failed: 0:44(42): warning: `cogl_texel0' used uninitialized 0:72(36): error: could not implicitly convert operands to arithmetic operator 0:72(18): error: operands to arithmetic operators must be numeric Jan 21 10:25:58 HackBook gnome-shell[1919]: Failed to link GLSL program: error: linking with uncompiled/unspecialized shader Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:384: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:399: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:409: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:796: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:823: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:827: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:831: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-buffer-gl.c:198: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:213: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:213: GL error (1282): Invalid operation Jan 21 10:25:58 HackBook gnome-shell[1919]: driver/gl/cogl-pipeline-progend-glsl.c:213: GL error (1282): Invalid operation Jan 21 10:26:02 HackBook /usr/lib/gdm3/gdm-wayland-session[1368]: gnome-session-binary[1372]: DEBUG(+): GsmSystemd: received logind signal: PrepareForShutdown Jan 21 10:26:02 HackBook gnome-session-binary[1372]: DEBUG(+): GsmSystemd: received logind signal: PrepareForShutdown But that GLSL trouble might not be the real problem. If you look at the timestamps you can see there is only 4 seconds between the GLSL errors and the machine being told to shut down. So I suspect you're not waiting long enough for the machine to start up and killing it in the middle of the start-up process (which seems very slow, but still seems to be working). Please try waiting 15 minutes next time and send us a fresh log from that. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1811599 Title: When booting, the computer hangs at a purple screen and no login prompt is ever displayed [Apple Macbook 2,1 - Core 2 T7200] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1811599/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs