You appear to have packages installed from xenial-proposed and xenial-updates. This would indicate that -proposed was enabled at some point in time in the past on this machine. You need to downgrade packages.
What does downgrade result in? E.g.: $ sudo apt install libsystemd-dev=229-4ubuntu16 libsystemd0=229-4ubuntu16 And similarly declare any other packages for downgrade, if above still complaints about systemd related packages. ** Changed in: systemd (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1671003 Title: unable to "apt-get install libsystemd-dev" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1671003/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs