Package akonadi-backend-sqlite has dependency for virtual package qtbase-abi-5-4-2 which is supposed to be provided by libqt5core5a but the recent build of libqt5core5a now provides qtbase-abi-5-5-1. This causes broken dependency and akonadi-backend-sqlite would be removed from your system if you have it installed. Manually re/installing it not possible Reproducible: Always Steps to Reproduce: 1. Add kubuntu ci ppa: https://launchpad.net/~kubuntu-ci/+archive/ubuntu/stable 2. sudo apt-get update && sudo apt-get upgrade -y 3. sudo apt-get install akonadi-backend-sqlite Actual Results: The following packages have unmet dependencies: akonadi-backend-sqlite : Depends: qtbase-abi-5-4-2 E: Unable to correct problems, you have held broken packages. Expected Results: akonadi-backend-sqlite installed fine without any error