/usr/share/app-install/desktop/ttb:ttb.desktop is in app-install-data 15.10.
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 11 12 13 14 15 16 | [Desktop Entry]
X-AppInstall-Package=ttb
X-AppInstall-Popcon=4
X-AppInstall-Section=universe
Name=TTB Teletekst Browser
Comment=Teletekst Browser
TryExec=ttb
Exec=ttb
Type=Application
Terminal=false
Categories=Network;
Icon=ttb
X-Ubuntu-Gettext-Domain=app-install-data
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