I've also tested an upgrade of a Trusty desktop to Xenial and while the upgrade is in progress, it has gotten past the failure to calculate the upgrade. Subsequently, I'm marking the kmod task as Invalid. It'd still be good to get mvo's apt fix added in some form and make ubuntu-release- upgrader more informative as to the failure.
** Changed in: kmod (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1550741 Title: Upgrade failed - unauthenticated package (module-init-tools) Status in apt package in Ubuntu: Confirmed Status in kmod package in Ubuntu: Invalid Status in ubuntu-release-upgrader package in Ubuntu: Confirmed Bug description: Upgrading an updated (+ hwe) 14.04 to 16.04 fails on module-init-tools being unauthentiated ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: ubuntu-release-upgrader-core 1:0.220.8 ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3 Uname: Linux 4.2.0-30-generic i686 ApportVersion: 2.14.1-0ubuntu3.19 Architecture: i386 CrashDB: ubuntu CurrentDesktop: XFCE Date: Sat Feb 27 15:46:12 2016 InstallationDate: Installed on 2016-02-27 (0 days ago) InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: ubuntu-release-upgrader UpgradeStatus: Upgraded to trusty on 2016-02-27 (0 days ago) VarLogDistupgradeTermlog: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1550741/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp