I am trying to follow instruction presented here: How to install GCC 5 on debian jessie 8.1
but I am getting this error:
sudo apt-get install -t testing gcc 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: gsettings-desktop-schemas : Breaks: gnome-settings-daemon (< 3.19.92) but 3.14.2-3 is to be installed Breaks: mutter (< 3.19.92) but 3.14.4-1~deb8u1 is to be installed gstreamer1.0-plugins-base : Breaks: gstreamer1.0-plugins-bad (< 1.7.90) but 1.4.4-2.1+deb8u1 is to be installed libgstreamer-plugins-base1.0-0 : Breaks: gstreamer1.0-plugins-bad (< 1.7.1) but 1.4.4-2.1+deb8u1 is to be installed libpam-systemd : Depends: systemd (= 215-17+deb8u6) but 232-15 is to be installed libvlccore8 : Breaks: vlc (< 2.2.4-7~) but 2.2.4-1~deb8u1 is to be installed Breaks: vlc-nox (< 2.2.4-7~) but 2.2.4-1~deb8u1 is to be installed systemd-sysv : Depends: systemd (= 215-17+deb8u6) but 232-15 is to be installed task-cinnamon-desktop : Depends: cinnamon-desktop-environment but it is not going to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
What is the problem and how I can fix it?