I have noticed that should a user logout and then login a second time the updater applet in the system tray provides the below error from the notifications upon checking for updates. (it functions perfectly for the first session after a reboot.)
http://s11.postimg.org/vkpy2v2eb/update_error.png
Related journald logs below
http://s7.postimg.org/l5eycmlzv/journal.png
Additionally for the second (or subsequent) session for a given user after a full reboot, attachable media like usb drives and SD cards required the root password to be entered to mount the drive. No root password was needed to mount drives upon the first session for a user after reboot.
I am not sophisticated enough to produce a proper bug report I was hoping a more experienced user would be able to test this out.
Thanks