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 Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1671003 Title: unable to "apt-get install libsystemd-dev" Status in systemd package in Ubuntu: Invalid Bug description: 1) # lsb_release -rd Description: Ubuntu 16.04.2 LTS Release: 16.04 2) # apt-cache policy libsystemd-dev libsystemd-dev: Installed: (none) Candidate: 229-4ubuntu16 Version table: 229-4ubuntu16 500 500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages 229-4ubuntu10 500 500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages 229-4ubuntu4 500 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages 3) I expected the package to be installed 4) # apt-get install libsystemd-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libsystemd-dev : Depends: libsystemd0 (= 229-4ubuntu16) but 229-4ubuntu17 is to be installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1671003/+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