Não é possível instalar a dependência libmagick++ do Inkscape no Xubuntu 16.04

Não é possível instalar a dependência libmagick++ do Inkscape no Xubuntu 16.04

Estou tentando (sem sucesso) instalar o Inkscape no Xubuntu 16.04. Se eu fizer sudo apt-get install inkscapeisso é o que recebo:

sudo apt-get install inkscape

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.
 inkscape : Depends: libmagick++-6.q16-5v5 (>= 8:6.8.9.9-7) but it is not going to be installed
            Recommends: libimage-magick-perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Eu tentei simplesmente instalar libmagick++, mas aqui está o resultado:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'libmagick++-dev' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-5' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-6' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-7' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16' for regex 'libmagick+'
Note, selecting 'libmagick++-6.defaultquantum-dev' for regex 'libmagick+'
Note, selecting 'libmagickwand-6.q16-2' for regex 'libmagick+'
Note, selecting 'libmagickwand-6.q16-3' for regex 'libmagick+'
Note, selecting 'libmagickwand-6-headers' for regex 'libmagick+'
Note, selecting 'libmagick++6-dev' for regex 'libmagick+'
Note, selecting 'libmagick9-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-1-extra' for regex 'libmagick+'
Note, selecting 'libmagick++-6-headers' for regex 'libmagick+'
Note, selecting 'graphicsmagick-libmagick-dev-compat' for regex 'libmagick+'
Note, selecting 'libmagickwand5' for regex 'libmagick+'
Note, selecting 'libmagickcore-extra' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.defaultquantum-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-2-extra' for regex 'libmagick+'
Note, selecting 'libmagickcore-6-headers' for regex 'libmagick+'
Note, selecting 'libmagickcore-6-arch-config' for regex 'libmagick+'
Note, selecting 'libmagickwand-6.defaultquantum-dev' for regex 'libmagick+'
Note, selecting 'libmagickwand-6.q16-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-2' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-3' for regex 'libmagick+'
Note, selecting 'libmagick++9-dev' for regex 'libmagick+'
Note, selecting 'libmagickwand-dev' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-5v5' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-3-extra' for regex 'libmagick+'
Note, selecting 'libmagick-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-6.q16-dev' for regex 'libmagick+'
Note, selecting 'libmagick6-dev' for regex 'libmagick+'
Note, selecting 'libmagickcore-dev' for regex 'libmagick+'
Note, selecting 'libmagick++-6.q16-dev' instead of 'libmagick++-6.defaultquantum-dev'
Note, selecting 'libmagickcore-6.q16-dev' instead of 'libmagickcore-6.defaultquantum-dev'
Note, selecting 'libmagickwand-6.q16-dev' instead of 'libmagickwand-6.defaultquantum-dev'
Note, selecting 'graphicsmagick-libmagick-dev-compat' instead of 'libmagick-dev'
libmagick++-6-headers is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagick++-6-headers set to manually installed.
libmagick++-6.q16-dev is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagick++-6.q16-dev set to manually installed.
libmagickcore-6.q16-3 is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickcore-6.q16-3 set to manually installed.
libmagickwand-6-headers is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickwand-6-headers set to manually installed.
libmagickcore-6-arch-config is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickcore-6-arch-config set to manually installed.
libmagickwand-6.q16-dev is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickwand-6.q16-dev set to manually installed.
libmagick++-6.q16-7 is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagick++-6.q16-7 set to manually installed.
libmagickcore-6.q16-3-extra is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickcore-6.q16-3-extra set to manually installed.
libmagickwand-6.q16-3 is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickwand-6.q16-3 set to manually installed.
libmagickcore-6.q16-dev is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickcore-6.q16-dev set to manually installed.
libmagickcore-6-headers is already the newest version (8:6.9.7.4+dfsg-16xenial0).
libmagickcore-6-headers set to manually installed.
libmagick++-dev is already the newest version (8:6.9.7.4+dfsg-16xenial0).
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.
 graphicsmagick-libmagick-dev-compat : Conflicts: libmagick++-dev
                                       Conflicts: libmagick++-dev:i386
                                       Conflicts: libmagickcore-dev but 8:6.8.9.9-7ubuntu5.15 is to be installed
                                       Conflicts: libmagickcore-dev:i386
 imagemagick-6-common : Breaks: libmagickcore-6.q16-2 (< 8:6.9.6.2+dfsg-3~) but 8:6.8.9.9-7ubuntu5.15 is to be installed
 libmagickcore-6.q16-2 : Depends: imagemagick-common (= 8:6.8.9.9-7ubuntu5.15)
 libmagickwand-6.q16-2 : Depends: imagemagick-common (= 8:6.8.9.9-7ubuntu5.15)
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

Também tentei instalar o Inkscape do PPA com os mesmos resultados. Toda e qualquer indicação seria apreciada. Nenhuma das perguntas semelhantes que encontrei tinha esse problema.

Muito obrigado!

ATUALIZAR:

conforme sugerido por N0rbert, executei sudo apt-get updatee tentei novamente sudo apt-get install inkscape, mas os resultados são os mesmos. Adicionalmente:

apt-cache policy inkscape libmagick++-6.q16-5v5
inkscape:
  Installed: (none)
  Candidate: 0.91-7ubuntu2
  Version table:
     0.91-7ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
libmagick++-6.q16-5v5:
  Installed: (none)
  Candidate: 8:6.8.9.9-7ubuntu5.15
  Version table:
     8:6.8.9.9-7ubuntu5.15 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
     8:6.8.9.9-7ubuntu5 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages

grep -ir "^deb" /etc/apt/ --include=*.list
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial main restricted
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial universe
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-updates universe
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial multiverse
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-updates multiverse
/etc/apt/sources.list:deb http://archive.canonical.com/ubuntu xenial partner
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-security main restricted
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-security universe
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu xenial-security multiverse
/etc/apt/sources.list:deb http://archive.canonical.com/ xenial partner
/etc/apt/sources.list:deb http://qgis.org/debian xenial main
/etc/apt/sources.list:deb https://cloud.r-project.org//bin/linux/ubuntu xenial/
/etc/apt/sources.list:deb http://download.ebz.epson.net/dsc/op/stable/debian/ lsb3.2 main
/etc/apt/sources.list:deb https://cloud.r-project.org/bin/linux/ubuntu xenial-cran35/
/etc/apt/sources.list.d/dropbox.list:deb [arch=i386,amd64] http://linux.dropbox.com/ubuntu xenial main
/etc/apt/sources.list.d/webupd8team-ubuntu-java-xenial.list:deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main
/etc/apt/sources.list.d/apandada1-ubuntu-brightness-controller-xenial.list:deb http://ppa.launchpad.net/apandada1/brightness-controller/ubuntu xenial main
/etc/apt/sources.list.d/libreoffice-ubuntu-ppa-xenial.list:deb http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial main
/etc/apt/sources.list.d/mendeleydesktop.list:deb https://desktop-download.mendeley.com/download/apt stable main
/etc/apt/sources.list.d/graphics-drivers-ubuntu-ppa-xenial.list:deb http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial main
/etc/apt/sources.list.d/danielrichter2007-ubuntu-grub-customizer-xenial.list:deb http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu xenial main
/etc/apt/sources.list.d/otto-kesselgulasch-ubuntu-gimp-xenial.list:deb http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu xenial main
/etc/apt/sources.list.d/spotify.list:deb http://repository.spotify.com stable non-free

Por favor, deixe-me saber se mais alguma informação for útil!

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