First, I don't seem to have duplicate sources in
apt, because via the terminal I get
$ sudo apt-get update [sudo] password for user: Hit:1 http://archive.canonical.com/ubuntu xenial InRelease Hit:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease Hit:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease Hit:4 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease Hit:5 https://brave-browser-apt-release.s3.brave.com bionic InRelease Reading package lists... Done
Yet in the Software Updater's 'Other Software' settings window, I have multiple repeat entries:
How did this happen and how do I correct it? Shouldn't there only be one item per source, especially since there is no text to distinguish differences?