Comment 6 for bug 1380364

That change made the unity-control-center user's panel history dialog stop working since it's filtering graphical session by they ":" entries and now those are writted as "tty"

See https://code.launchpad.net/~seb128/unity-control-center/user-graphical-sessions/+merge/210510 for some context

We either need to revert that change or to update u-c-c, note that the issue should be sorted out before an eventual SRU of the lightdm change