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I made a fresh install of KUbuntu 18.04 and now when I try to update packages using sudo apt-get update I get the following error

E: The repository 'http://ppa.launchpad.net/docky-core/stable/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

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