/usr/share/xsessions/plasma-active.desktop is in kubuntu-settings-active 1:14.04ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Desktop Entry]
Encoding=UTF-8
Type=XSession
Exec=/usr/bin/startactive
TryExec=/usr/bin/startactive
Name=KDE Plasma Active Contour Workspace
Comment=The mobile desktop made by KDE
|