what's problem with this octave installation?

>$ sudo apt-get install octave 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: gnupg : Breaks: software-properties-common (= 2.8.4) but it is not going to be installed Depends: libqt5gui5 (>= 5.7.0) but it is not going to be installed Depends: libqt5opengl5 (>= 5.0.2) but it is not going to be installed Depends: libqt5printsupport5 (>= 5.0.2) but it is not going to be installed Depends: libqt5widgets5 (>= 5.6.0~beta) but it is not going to be installed Recommends: gnuplot-qt but it is not going to be installed or gnuplot-x11 but it is not going to be installed or gnuplot-nox E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.