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2016/08/05 ubuntu security updates break login

a guest Aug 5th, 2016 53 Never
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  1. So this morning (5 August 2016) on Ubuntu 16.04 LTS I tried doing an apt-get update / apt-get upgrade security pass and it rendered my gnome3 installation unable to log in anyone through the GUI. Going to a tty screen _does_ allow login; trying through the GUI does not, on any account, including guest.
  2.  
  3. After searching a couple of hours for possible fixes and getting nowhere, I restored my previous root image, fortunately made only a few days ago. After restoring from dd-created image and booting/logging-in successfully, trying again to apt-get update / apt-get upgrade produced the same results: no ability to log in under gnome3.
  4.  
  5. Syslog was unrevealing but the first error was saying that org.gnome.SessionManager was not being provided by any .desktop file, and as far as I can find from searching, that is a harmless warning message. The closest thing to a relevant error I found indicated that it is in fact not generally provided by a .service file but is launched via /usr/bin/gnome-session which I have and which had correct executable permissions. I also have/had the correct xml file for the service. But all of that could've been completely irrelevant.
  6.  
  7. ----- Here is a saved .xsession-errors file:
  8.  
  9. openConnection: connect: No such file or directory
  10. cannot connect to brltty at :0
  11. upstart: gnome-session (GNOME) main process (3277) terminated with status 1
  12. upstart: logrotate main process (3137) killed by TERM signal
  13. upstart: bamfdaemon main process (3213) killed by TERM signal
  14. upstart: upstart-dbus-session-bridge main process (3258) terminated with status 1
  15. upstart: Disconnected from notified D-Bus bus
  16.  
  17. ----- Here is the list of packages it wants to update: firefox firefox-locale-en firefox-locale-ja grub-common grub-pc grub-pc-bin grub2-common less libegl1-mesa libgbm1 libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libgles1-mesa libgles2-mesa libllvm3.8 libwayland-egl1-mesa libxatracker2 mesa-vdpau-drivers snapd xserver-common xserver-xephyr xserver-xorg-core
  18.  
  19. ----- And here's some low-level data which may and may not have any relevance:
  20.  
  21. Video driver: nvidia-367.27 (32-bit) from NVIDIA-Linux-x86-367.27 downloaded from their website.
  22.  
  23. $ cat /proc/version
  24. Linux version 4.4.0-31-lowlatency (buildd@lgw01-58) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #50-Ubuntu SMP PREEMPT Wed Jul 13 00:50:28 UTC 2016
  25.  
  26. $ lsb_release -a
  27. LSB Version:    core-9.20160110ubuntu0.2-ia32:core-9.20160110ubuntu0.2-noarch:printing-9.20160110ubuntu0.2-ia32:printing-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-ia32:security-9.20160110ubuntu0.2-noarch
  28. Distributor ID: Ubuntu
  29. Description:    Ubuntu 16.04.1 LTS
  30. Release:    16.04
  31. Codename:   xenial
  32.  
  33. $ cat /etc/X11/xorg.conf
  34. # nvidia-xconfig: X configuration file generated by nvidia-xconfig
  35. # nvidia-xconfig:  version 367.27  (buildmeister@swio-display-x64-rhel04-11)  Thu Jun  9 19:26:08 PDT 2016
  36.  
  37.  
  38. Section "ServerLayout"
  39.     Identifier     "Layout0"
  40.     Screen      0  "Screen0" 0 0
  41.     InputDevice    "Keyboard0" "CoreKeyboard"
  42.     InputDevice    "Mouse0" "CorePointer"
  43. EndSection
  44.  
  45. Section "Files"
  46. EndSection
  47.  
  48. Section "InputDevice"
  49.  
  50.     # generated from default
  51.     Identifier     "Mouse0"
  52.     Driver         "mouse"
  53.     Option         "Protocol" "auto"
  54.     Option         "Device" "/dev/psaux"
  55.     Option         "Emulate3Buttons" "no"
  56.     Option         "ZAxisMapping" "4 5"
  57. EndSection
  58.  
  59. Section "InputDevice"
  60.  
  61.     # generated from default
  62.     Identifier     "Keyboard0"
  63.     Driver         "kbd"
  64. EndSection
  65.  
  66. Section "Monitor"
  67.     Identifier     "Monitor0"
  68.     VendorName     "Unknown"
  69.     ModelName      "Unknown"
  70.     HorizSync       28.0 - 33.0
  71.     VertRefresh     43.0 - 72.0
  72.     Option         "DPMS"
  73. EndSection
  74.  
  75. Section "Device"
  76.     Identifier     "Device0"
  77.     Driver         "nvidia"
  78.     VendorName     "NVIDIA Corporation"
  79. EndSection
  80.  
  81. Section "Screen"
  82.     Identifier     "Screen0"
  83.     Device         "Device0"
  84.     Monitor        "Monitor0"
  85.     DefaultDepth    24
  86.     DefaultFbBPP    32
  87.     Option         "TransparentIndex" "0"
  88.     SubSection     "Display"
  89.         Depth       24
  90.     EndSubSection
  91. EndSection
  92.  
  93. ----- contact
  94.  
  95. If anyone has any interest in contacting me about any of this, use the contact form at crimeandtheforcesofevil.com.
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