Comment 2 for bug 1874158

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Brian Murray (brian-murray) wrote : Re: Upgrading Ubuntu to version 18.04 Invalid package information

The mirror of Ubuntu which you are using in an unofficial one and the release upgrader did not fall back to a generic one in your case. If you just want to upgrade please switch to an official mirror of the Ubuntu archive. You can find a list here:

https://launchpad.net/ubuntu/+archivemirrors