/usr/share/xsessions/unity.desktop is in unity-session 3.28.1-0ubuntu2.
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 | [Desktop Entry]
Name=Unity
Comment=This session logs you into Unity
Exec=/usr/lib/gnome-session/run-systemd-session unity-session.target
TryExec=unity
Type=Application
DesktopNames=Unity:Unity7:ubuntu
X-Ubuntu-Gettext-Domain=gnome-session-3.0
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