I have two programs called
settings. Is there a reason to have two of them?
This is a typical Linux system design issue and would never happen on Mac or Win.
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There are three packages which may affect your experience in this case:
"Settings" is the standard settings app when using the GNOME Desktop Experience, which is the default with current Ubuntu 18.04.
"System Settings" was the default settings app for Ubuntu 16.04, the previous LTS release of Ubuntu, which used the Unity DE.
"Tweaks" is probably GNOME Tweaks, an app that exposes settings which are accessible normally only using the command line interface in the GNOME DE. Similar to what "Unity Tweak Tool" was for Unity in 16.04.
System Settings is probably a leftover from 16.04, if you recently upgraded to 18.04. Maybe the upgrade process did not uninstall Unity, and you still have it along with its apps in your installation; although I am not sure if it could happen like this, I have never upgraded a Ubuntu install. Or it could be that you installed the
ubuntu-unity-desktop meta-package in 18.04 and it actually installed Unity along with its whole stack of apps, including System Settings.