query: Upgrade from 14.04 to 15.04 gives error
positive_passages.docid: 211
positive_passages.text: Can I skip over releases when upgrading?
negative_passages.docid: 61473
negative_passages.text: Failed to fetch because of size mismatch error while upgrading
negative_passages.docid: 76241
negative_passages.text: "no public key available" while upgrading using update-manager
negative_passages.docid: 123455
negative_passages.text: Unable to update Node JS - keeps returning to old version [Ubuntu 15.04]
negative_passages.docid: 76248
negative_passages.text: "Failed to start session" after interrupted upgrade to 14.04
negative_passages.docid: 67481
negative_passages.text: How to revert a do-release-upgrade?
negative_passages.docid: 151605
negative_passages.text: upgrading from 15.10 to 16.04 apt not installed
negative_passages.docid: 18057
negative_passages.text: Errors encountered when installing kubuntu on 15.04
negative_passages.docid: 140893
negative_passages.text: Error when using apt-get update
negative_passages.docid: 110148
negative_passages.text: Why does `do-release-upgrade` skip a version?
negative_passages.docid: 154622
negative_passages.text: How do I resolve this installation error?
negative_passages.docid: 59088
negative_passages.text: How to upgrade to a newer release of Ubuntu using the Live CD?
negative_passages.docid: 5316
negative_passages.text: Update from 14.04 to 16.04 failed with GPG error
negative_passages.docid: 20398
negative_passages.text: dpkg broken after 15.04 upgrade fail
negative_passages.docid: 76905
negative_passages.text: Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
negative_passages.docid: 6913
negative_passages.text: Grub update warning in Ubuntu 14.04
negative_passages.docid: 51350
negative_passages.text: While updating the ubuntu 16.04 does not have a Release file Error