Both libudev-dev and libudev1 are built from the same source package so they should be in sync.
$ apt policy libudev-dev libudev-dev: Installert: (ingen) Kandidat: 237-3ubuntu10.3 Versjonstabell: 237-3ubuntu10.3 500 500 http://no.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 237-3ubuntu10 500 500 http://no.archive.ubuntu.com/ubuntu bionic/main amd64 Packages $ apt policy libudev1 libudev1: Installert: 237-3ubuntu10.3 Kandidat: 237-3ubuntu10.3 Versjonstabell: *** 237-3ubuntu10.3 500 500 http://no.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 237-3ubuntu10 500 500 http://no.archive.ubuntu.com/ubuntu bionic/main amd64 Packages Note that 10.3 was released through updates, and from your `apt policy` output you may have disabled this? Could you please open `software- properties-gtk`, go to the Updates tab and ensure bionic-security and bionic-updates are both checked? That way you'll recieve security as well as regular updates. In this case it sounds like you have parts of the newer packages installed, but it can only find the pre-update alternatives for the rest of them. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1792980 Title: cannot install libudev-dev To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1792980/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs