Public bug reported: When ubuntu starts up, gdm3 does not start due to a crash in the the xserver:
[ 1271.342] (II) SELinux: Disabled on system [ 1271.346] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer [ 1271.346] (II) AIGLX: enabled GLX_ARB_create_context [ 1271.346] (II) AIGLX: enabled GLX_ARB_create_context_profile [ 1271.346] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile [ 1271.346] (II) AIGLX: enabled GLX_INTEL_swap_event [ 1271.346] (II) AIGLX: enabled GLX_SGI_swap_control [ 1271.346] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB [ 1271.346] (II) AIGLX: enabled GLX_ARB_fbconfig_float [ 1271.346] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float [ 1271.346] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects [ 1271.346] (II) AIGLX: enabled GLX_ARB_create_context_robustness [ 1271.346] (II) AIGLX: Loaded and initialized i965 [ 1271.346] (II) GLX: Initialized DRI2 GL provider for screen 0 [ 1271.348] (II) modeset(0): Damage tracking initialized [ 1271.348] (II) modeset(0): Setting screen physical size to 508 x 317 [ 1271.352] (EE) [ 1271.352] (EE) Backtrace: [ 1271.352] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4d) [0x5649b579bacd] [ 1271.352] (EE) 1: /usr/lib/xorg/Xorg (0x5649b55e3000+0x1bc869) [0x5649b579f869] [ 1271.352] (EE) 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f5c7d0a5000+0x128a0) [0x7f5c7d0b78a0] [ 1271.352] (EE) 3: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x8e8652) [0x7f5c784e2652] [ 1271.352] (EE) 4: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x8e877f) [0x7f5c784e277f] [ 1271.352] (EE) 5: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x122916) [0x7f5c77d1c916] [ 1271.352] (EE) 6: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x1189bc) [0x7f5c77d129bc] [ 1271.352] (EE) 7: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x109c1b) [0x7f5c77d03c1b] [ 1271.352] (EE) 8: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x279558) [0x7f5c77e73558] [ 1271.352] (EE) 9: /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (0x7f5c77bfa000+0x2796e3) [0x7f5c77e736e3] [ 1271.352] (EE) 10: /usr/lib/xorg/modules/libglamoregl.so (0x7f5c79937000+0x1a1ab) [0x7f5c799511ab] [ 1271.352] (EE) 11: /usr/lib/xorg/Xorg (0x5649b55e3000+0x13ed03) [0x5649b5721d03] [ 1271.352] (EE) 12: /usr/lib/xorg/Xorg (miPaintWindow+0x22f) [0x5649b577fd1f] [ 1271.352] (EE) 13: /usr/lib/xorg/Xorg (miWindowExposures+0x112) [0x5649b577fa62] [ 1271.352] (EE) 14: /usr/lib/xorg/Xorg (0x5649b55e3000+0xa9c41) [0x5649b568cc41] [ 1271.352] (EE) 15: /usr/lib/xorg/Xorg (MapWindow+0x114) [0x5649b5665d04] [ 1271.352] (EE) 16: /usr/lib/xorg/Xorg (0x5649b55e3000+0x56e79) [0x5649b5639e79] [ 1271.352] (EE) 17: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x7f5c7ccd5b97] [ 1271.352] (EE) 18: /usr/lib/xorg/Xorg (_start+0x2a) [0x5649b5623b8a] [ 1271.352] (EE) [ 1271.352] (EE) Segmentation fault at address 0x4 [ 1271.352] (EE) Fatal server error: [ 1271.352] (EE) Caught signal 11 (Segmentation fault). Server aborting [ 1271.352] (EE) [ 1271.352] (EE) As i965_dri.so is part of the libgl-mesa-dri package I downgraded this specific package from version 20.0.8-0ubuntu1~18.04.1 back to 19.2.8-0ubuntu0~18.04.3. This solves the problem. So I suspect that the problem is in this specific package. My machine is (uname): 4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:29:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux (lspci) 00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06) 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) 00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04) 00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5) 00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5) 00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation H81 Express LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05) 00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05) 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c) ** Affects: apport (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890411 Title: Xorg crashes when starting gdm3. Bug in libgl1-mesa-dri. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1890411/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs