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OS: Debian 8.7
Related bug: gufw: desktop entry doesn't show up in desktop environments

I do the following and get sudo apt -t unstable install gufw

[sudo] password for masi: 
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+deb8u1 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 (< 1.11.90) but 1.4.4-2.1+deb8u2 is to be installed
 libgstreamer-plugins-base1.0-0 : Breaks: gstreamer1.0-plugins-bad (< 1.7.1) but 1.4.4-2.1+deb8u2 is to be installed
 libgstreamer1.0-0 : Breaks: gstreamer1.0-plugins-bad (< 1.11.1) but 1.4.4-2.1+deb8u2 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

OS: Debian 8.7
Related bug: gufw: desktop entry doesn't show up in desktop environments

1. Studying the package masi@masi:$ apt search gufw

    Sorting... Done
    Full Text Search... Done
    gufw/oldstable,oldstable,now 12.10.0-1 all [installed]
      graphical user interface for ufw
   

2. Installation by method apt install gufw

3. Output of apt show -a gufw where I am thinking about two packages (17.04 and 12.10) so something conflicting in my system - for some reason gufw in terminal starts gufw 12.10

    Package: gufw
    Source: gui-ufw
    Version: 17.04.1-1.1
    Installed-Size: 3,376 kB
    Maintainer: Python Applications Packaging Team <[email protected]>
    Depends: python3:any (>= 3.3.2-2~), ufw (>= 0.34~rc), gir1.2-gtk-3.0, policykit-1, gir1.2-webkit2-4.0, python3-gi, net-tools
    Homepage: http://gufw.org/
    Tag: admin::configuring, implemented-in::python, interface::graphical,
     interface::x11, network::firewall, role::program, scope::utility,
     security::firewall, uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 842 kB
    APT-Sources: http://ftp.fr.debian.org/debian/ unstable/main amd64 Packages
   
    Package: gufw
    Source: gui-ufw
    Version: 12.10.0-1
    Installed-Size: 1,328 kB
    Maintainer: Devid Antonio Filoni <[email protected]>
    Depends: python (>= 2.6.6-7~), ufw (>= 0.31.1), gir1.2-gtk-3.0, gir1.2-polkit-1.0, notify-osd | notification-daemon, policykit-1, python-dbus, python-gobject, gnome-icon-theme-symbolic
    Homepage: https://launchpad.net/gui-ufw
    Tag: admin::configuring, implemented-in::python, interface::x11,
     network::firewall, role::program, scope::utility, security::firewall,
     uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 261 kB
    APT-Manual-Installed: yes
    APT-Sources: http://ftp.fi.debian.org/debian/ jessie/main amd64 Packages
   

1. Studying the package masi@masi:$ apt search gufw

    Sorting... Done
    Full Text Search... Done
    gufw/oldstable,oldstable,now 12.10.0-1 all [installed]
      graphical user interface for ufw
   

2. Installation by method apt install gufw

3. Output of apt show -a gufw where I am thinking about two packages (17.04 and 12.10) so something conflicting in my system - for some reason gufw in terminal starts gufw 12.10

    Package: gufw
    Source: gui-ufw
    Version: 17.04.1-1.1
    Installed-Size: 3,376 kB
    Maintainer: Python Applications Packaging Team <[email protected]>
    Depends: python3:any (>= 3.3.2-2~), ufw (>= 0.34~rc), gir1.2-gtk-3.0, policykit-1, gir1.2-webkit2-4.0, python3-gi, net-tools
    Homepage: http://gufw.org/
    Tag: admin::configuring, implemented-in::python, interface::graphical,
     interface::x11, network::firewall, role::program, scope::utility,
     security::firewall, uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 842 kB
    APT-Sources: http://ftp.fr.debian.org/debian/ unstable/main amd64 Packages
   
    Package: gufw
    Source: gui-ufw
    Version: 12.10.0-1
    Installed-Size: 1,328 kB
    Maintainer: Devid Antonio Filoni <[email protected]>
    Depends: python (>= 2.6.6-7~), ufw (>= 0.31.1), gir1.2-gtk-3.0, gir1.2-polkit-1.0, notify-osd | notification-daemon, policykit-1, python-dbus, python-gobject, gnome-icon-theme-symbolic
    Homepage: https://launchpad.net/gui-ufw
    Tag: admin::configuring, implemented-in::python, interface::x11,
     network::firewall, role::program, scope::utility, security::firewall,
     uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 261 kB
    APT-Manual-Installed: yes
    APT-Sources: http://ftp.fi.debian.org/debian/ jessie/main amd64 Packages
   

4. Output of apt-cache policy gufw

    gufw:
      Installed: 12.10.0-1
      Candidate: 12.10.0-1
      Version table:
          17.04.1-1.1 0
            200 http://ftp.fr.debian.org/debian/ unstable/main amd64 Packages
      *** 12.10.0-1 0
            500 http://ftp.fi.debian.org/debian/ jessie/main amd64 Packages
            500 http://httpredir.debian.org/debian/ jessie/main amd64 Packages
            100 /var/lib/dpkg/status
   

5. Output of dpkg -l gufw

     Desired=Unknown/Install/Remove/Purge/Hold
     | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
     |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
     ||/ Name                            Version              Architecture         Description
      +++-===============================-====================-====================-====================================================================
     ii  gufw                            12.10.0-1            all                  graphical user interface for ufw
   

OS: Debian 8.7

Installation and testing the packages installed

1. Studying the package masi@masi:$ apt search gufw

    Sorting... Done
    Full Text Search... Done
    gufw/oldstable,oldstable,now 12.10.0-1 all [installed]
      graphical user interface for ufw
   

2. Installation by method apt install gufw

3. Output of apt show -a gufw where I am thinking about two packages (17.04 and 12.10) so something conflicting in my system - for some reason gufw in terminal starts gufw 12.10

    Package: gufw
    Source: gui-ufw
    Version: 17.04.1-1.1
    Installed-Size: 3,376 kB
    Maintainer: Python Applications Packaging Team <[email protected]>
    Depends: python3:any (>= 3.3.2-2~), ufw (>= 0.34~rc), gir1.2-gtk-3.0, policykit-1, gir1.2-webkit2-4.0, python3-gi, net-tools
    Homepage: http://gufw.org/
    Tag: admin::configuring, implemented-in::python, interface::graphical,
     interface::x11, network::firewall, role::program, scope::utility,
     security::firewall, uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 842 kB
    APT-Sources: http://ftp.fr.debian.org/debian/ unstable/main amd64 Packages
   
    Package: gufw
    Source: gui-ufw
    Version: 12.10.0-1
    Installed-Size: 1,328 kB
    Maintainer: Devid Antonio Filoni <[email protected]>
    Depends: python (>= 2.6.6-7~), ufw (>= 0.31.1), gir1.2-gtk-3.0, gir1.2-polkit-1.0, notify-osd | notification-daemon, policykit-1, python-dbus, python-gobject, gnome-icon-theme-symbolic
    Homepage: https://launchpad.net/gui-ufw
    Tag: admin::configuring, implemented-in::python, interface::x11,
     network::firewall, role::program, scope::utility, security::firewall,
     uitoolkit::gtk, use::configuring, x11::application
    Section: admin
    Priority: optional
    Download-Size: 261 kB
    APT-Manual-Installed: yes
    APT-Sources: http://ftp.fi.debian.org/debian/ jessie/main amd64 Packages
   

OS: Debian 8.7
Related bug: gufw: desktop entry doesn't show up in desktop environments