/usr/share/app-install/desktop/octave:www.octave.org-octave.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 17 18 | [Desktop Entry]
X-AppInstall-Package=octave
X-AppInstall-Popcon=241
X-AppInstall-Section=universe
Name=GNU Octave
Comment=Scientific Computing using GNU Octave
TryExec=/usr/bin/octave
Exec=/usr/bin/octave --force-gui
Icon=_usr_share_octave_4.0.0_imagelib_octave-logo
Terminal=false
Type=Application
Categories=Education;Science;Math;
StartupNotify=false
MimeType=text/x-octave;text/x-matlab;
X-Desktop-File-Install-Version=0.22
X-Ubuntu-Gettext-Domain=app-install-data
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