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When I ran Software Updater I was given an error message saying

Failed to download repository information, check your internet connection.

This is what it says:

W:The repository 'http://ppa.launchpad.net/upubuntu-com/icons/ubuntu xenial Release' does not have a Release file.
W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
W:See apt-secure(8) manpage for repository creation and user configuration details.
E:Failed to fetch http://ppa.launchpad.net/upubuntu-com/icons/ubuntu/dists/xenial/main/source/Sources  404  Not Found, 
E:Some index files failed to download. They have been ignored, or old ones used instead.
David Foerster
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drexit
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1 Answers1

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The PPA you've added, ppa:upubuntu-com/icons, doesn't support Ubuntu 16.04. As you can see from their list of supported releases, the last supported release is wily, or Ubuntu 15.10.

You'll need to either remove that PPA or try to set it to use wily instead of xenial. Find out which file has that PPA by running fgrep upubuntu-com /etc/apt/sources.list /etc/apt/sources.list.d/*, and proceed from there.

If the entry shows up in the file /etc/apt/sources.list, you can edit that file by running sudo nano /etc/apt/sources.list, finding the upubuntu-com line and either changing xenial to wily or removing the line.

If the entry shows up in a file under /etc/apt/sources.list.d, you can either delete the file or edit it using sudo nano file-path and changing xenial to wily.

After you've done that, run sudo apt update again.

Chai T. Rex
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