Package: cadabra Version: 1.46-2 Severity: serious User: debian-qa@lists.debian.org Usertags: piuparts Hi, texlive-math-extra is a real package in jessie but a virtual package provided by texlive-science in stretch. That causes a hard time for apt and it will likely remove cadabra instead of installing texlive-science during jessie->stretch upgrades. Andreas