Hmm... yes it seems like universe & multiverse pockets are enabled on this system for main and focal-security. However, it does have debug packages enabled for focal-updates via ddebs.list:
$ grep -ri '^deb.*ubuntu\.com' /etc/apt/sources.list* | sort | uniq /etc/apt/sources.list.d/ddebs.list:deb http://ddebs.ubuntu.com focal main restricted universe multiverse /etc/apt/sources.list.d/ddebs.list:deb http://ddebs.ubuntu.com focal-proposed main restricted universe multiverse /etc/apt/sources.list.d/ddebs.list:deb http://ddebs.ubuntu.com focal-updates main restricted universe multiverse /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu focal main restricted /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu focal multiverse /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu focal universe /etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu focal-updates main restricted /etc/apt/sources.list:deb http://security.ubuntu.com/ubuntu focal-security main restricted universe multiverse /etc/apt/sources.list:deb-src http://archive.ubuntu.com/ubuntu focal-updates main /etc/apt/sources.list:deb-src http://security.ubuntu.com/ubuntu focal-security main restricted universe multiverse I guess that I didn't realize the libvirt-dev package was released in a separate pocket / channel than the other libvirt packages. I've enabled both universe & multiverse for the focal-updates pocket too. Now it's showing up under apt-cache policy: $ apt-cache policy libvirt-dev libvirt-dev: Installed: 6.0.0-0ubuntu8.15 Candidate: 6.0.0-0ubuntu8.15 Version table: *** 6.0.0-0ubuntu8.15 500 500 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages 100 /var/lib/dpkg/status 6.0.0-0ubuntu8.3 500 500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages 6.0.0-0ubuntu8 500 500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1956169 Title: Cannot install libvirt-dev on Ubuntu 20.04 / focal Dependency conflict - needs repackage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1956169/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs