Updating the database ubuntu

To update Add/Remove’s database, you need to run “sudo update-app-install”. After that, your .desktop will appear in it’s index as a regular program!

However, by default update-app-install will scan all .desktop files in your system, which on low-end systems can take a while. To help speed that up, you can use the “sudo update-app-install -d ” syntax - point it to the directory where your .desktop is and things will be considerably faster.

https://wiki.ubuntu.com/