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During the last few upgrades I have encountered the error "E:The repository 'http://au.archive.ubuntu.com/ubuntu yakkety-backports Release' no longer has a Release file". (Until now I have been bypassing this by accepting a partial upgrade when offered by the Update Manager.) The error has occurred again when I attempted to upgrade from 18.10 to 19.04, so I will defer this upgrade in case there is a way of removing the problem repository from my system and enabling a standard upgrade.

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Find the respective line that starts by "deb" in file "/etc/apt/sources.list". Replace "yakkety-backports" by "disco-backports" in it, if you want to continue receiving backports, or delete the line otherwise.

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