.xsession-errors contains:

Xlib:  extension "GLX" missing on display ":0".
Xlib:  extension "GLX" missing on display ":0".
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
init: gnome-session (Unity) main process (2719) terminated with status 1
init: Disconnected from notified D-Bus bus
init: logrotate main process (2579) killed by TERM signal
init: update-notifier-crash 
(/var/crash/susres.2016-10-03_08:56:40.650760.crash) main process (2613) killed 
by TERM signal
init: update-notifier-crash (/var/crash/_usr_bin_eog.1001.crash) main process 
(2615) killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_lib_gvfs_gvfsd-afp.1001.crash) 
main process (2616) killed by TERM signal
init: update-notifier-crash 
(/var/crash/_usr_lib_gvfs_gvfsd-afp-browse.1001.crash) main process (2625) 
killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_lib_ibus_ibus-ui-gtk3.1001.crash) 
main process (2626) killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_lib_virtualbox_VirtualBox.0.crash) 
main process (2627) killed by TERM signal
init: update-notifier-crash 
(/var/crash/_usr_share_software-center_software-center.1001.crash) main process 
(2628) killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_bin_compiz.1001.crash) main 
process (2614) killed by TERM signal
init: xsession-init main process (2705) killed by TERM signal
init: hud main process (2712) killed by TERM signal
init: unity-panel-service main process (2732) killed by TERM signal
init: window-stack-bridge main process (2609) killed by KILL signal

Critical line is 
"gnome-session (Unity) main process (2719) terminated with status 1"

Similar posts on Ubuntu blogs point to a graphics driver incompatibility
- in my case caused by the recent substantial upgrade.

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https://bugs.launchpad.net/bugs/1629701

Title:
  log-in screen loops indefinitely

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