/usr/share/xsessions/ukui.desktop is in ukui-session-manager 1.1.2-0ubuntu1.
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 8 9 10 | [Desktop Entry]
Name=UKUI
Name[zh_CN]=UKUI
Comment=This session logs you into UKUI
Exec=ukui-session
TryExec=ukui-session
Icon=
Type=Application
DesktopNames=UKUI
Keywords=launch;UKUI;desktop;session;
|