This is very likely fixed in 1.3, as that got a whole lot of reworking in that area (and thus not backportable). If it pops up again with 1.3, please reopen the bug or report a new one.
** Changed in: apt (Ubuntu) Status: Confirmed => Fix Released -- 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/1574240 Title: package plymouth (not installed) failed to install/upgrade: conflicting packages - not installing plymouth Status in apt package in Ubuntu: Fix Released Bug description: bug on "do-release-upgrade" ProblemType: Package DistroRelease: Ubuntu 16.04 Package: plymouth (not installed) ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5 Uname: Linux 4.2.0-35-generic i686 ApportVersion: 2.19.1-0ubuntu5 Architecture: i386 Date: Sun Apr 24 15:01:57 2016 DuplicateSignature: package:plymouth:(not installed):conflicting packages - not installing plymouth ErrorMessage: conflicting packages - not installing plymouth RelatedPackageVersions: dpkg 1.18.2ubuntu5.1 apt 1.0.10.2ubuntu2 SourcePackage: plymouth Title: package plymouth (not installed) failed to install/upgrade: conflicting packages - not installing plymouth UpgradeStatus: Upgraded to xenial on 2016-04-24 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1574240/+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