/usr/share/cinnamon-session/sessions/cinnamon2d.session is in cinnamon-common 2.8.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Cinnamon Session]
Name=Cinnamon (Software Rendering)
RequiredComponents=cinnamon2d;cinnamon-polkit-gnome-authentication-agent-1;cinnamon-settings-daemon;cinnamon-screensaver;nemo-autostart;nm-applet;cinnamon-killer-daemon;
DesktopName=X-Cinnamon
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