2.1.1. Installing packages (GUI method)
Installing Listaller packages is really easy. Just make sure you have Listaller installed, then follow the steps below.
Listaller uses a system based on GPG-keys and some other values to check if a package can be trusted, as 3rd-party applications can come from any source and it is not certain that they won't contain malicious software.
The system administrator has set a minimum trust level for packages. If your package is below this level, you will not be able to install the package. By default, unsigned packages can never be installed without lowering the minimum security level.
If you have troubles installing an application because of this, you can temporarily change the minimum trust in Listaller's config file, or speak to your system administrator.