我正在尝试在 Xubuntu 16.04 上安装 Inkscape（但没有成功）。如果我sudo apt-get install inkscape这样做，我会得到以下结果：
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.
我天真地尝试简单地安装libmagick++，但结果如下：
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.
我也尝试从 PPA 安装 Inkscape，结果相同。任何指点都将不胜感激。我发现的类似问题都没有这个问题。
非常感谢！
更新：
根据 N0rbert 的建议，我已运行sudo apt-get update并重试sudo apt-get install inkscape，但结果相同。此外：
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
如果有更多信息有用，请告诉我！