Err:22 http://ddebs.ubuntu.com xenial-security Release
  404  Not Found
Hit:23 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease
Hit:24 http://ddebs.ubuntu.com xenial-updates Release
Hit:25 http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu xenial InRelease
Hit:26 http://ddebs.ubuntu.com xenial-proposed Release
Hit:27 http://ppa.launchpad.net/wine/wine-builds/ubuntu xenial InRelease
Get:28 http://ddebs.ubuntu.com xenial Release.gpg [836 B]
Reading package lists... Done
E: The repository 'http://ddebs.ubuntu.com xenial-security 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.