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# Ubuntu gnome 3
sudo apt-get install --no-install-recommends gnome-panel

gnome-desktop-item-edit ~/Desktop/ --create-new


# Ubuntu mate
mate-desktop-item-edit ~/Desktop/ --create-new

[Desktop Entry]
Name=NetBeans
Comment=Integrated Development Environment
Exec=netbeans
Icon=netbeans
Categories=Development;IDE;Java;
Terminal=false
Type=Application
Keywords=development;Java;IDE;platform;javafx;javase;

Once you have the file created, put the file into /usr/share/applications