/usr/share/app-install/desktop/proofgeneral:proofgeneral.desktop is in app-install-data 14.04.0.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=proofgeneral
X-AppInstall-Popcon=9
X-AppInstall-Section=universe
Type=Application
Version=1.0
Name=Proof General
GenericName=Theorem proving environment
Comment=Organise your proofs!
Icon=proofgeneral
TryExec=proofgeneral
Exec=proofgeneral %F
Terminal=false
Categories=Application;IDE;Development;TextEditor;Math
StartupWMClass=Emacs
X-Ubuntu-Gettext-Domain=app-install-data
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