This looks related:
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1072508
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https://bugs.launchpad.net/bugs/1122824
Title:
unity-applications-daemon left running after logout
To
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity-lens-applications (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1122