当我尝试使用 aptitude 安装 skype 时出现以下错误：
The following NEW packages will be installed:
libaudio2:i386{a} libavahi-client3:i386{a} libavahi-common-data:i386{a}
libavahi-common3:i386{a} libcgmanager0:i386{a} libcups2:i386{a}
libdbusmenu-qt2:i386{a} libdrm-intel1:i386{a} libdrm-nouveau2:i386{a}
libdrm-radeon1:i386{a} libelf1:i386{a} libexpat1:i386{a} libffi6:i386{a}
libfontconfig1:i386{ab} libgcrypt11:i386{a} libgl1-mesa-dri:i386{ab}
libgl1-mesa-glx:i386{ab} libglapi-mesa:i386{ab} libglib2.0-0:i386{a}
libgnutls26:i386{a} libgpg-error0:i386{a} libgssapi-krb5-2:i386{a}
libgstreamer-plugins-base1.0-0:i386{ab} libgstreamer1.0-0:i386{ab}
libice6:i386{a} libjbig0:i386{a} libjpeg-turbo8:i386{a} libjpeg8:i386{a}
libllvm3.4:i386{a} libmysqlclient18:i386{a} liborc-0.4-0:i386{a}
libp11-kit0:i386{a} libpciaccess0:i386{a} libqt4-dbus:i386{a}
libqt4-declarative:i386{a} libqt4-network:i386{a} libqt4-opengl:i386{a}
libqt4-script:i386{a} libqt4-sql:i386{a} libqt4-sql-mysql:i386{a}
libqt4-xml:i386{a} libqt4-xmlpatterns:i386{a} libqtcore4:i386{a}
libqtdbus4:i386{a} libqtgui4:i386{a} libqtwebkit4:i386{a}
libselinux1:i386{ab} libsm6:i386{a} libsqlite3-0:i386{a}
libssl1.0.0:i386{a} libtasn1-6:i386{a} libtiff5:i386{a}
libtxc-dxtn-s2tc0:i386{a} libudev1:i386{ab} libuuid1:i386{ab}
libx11-6:i386{a} libx11-xcb1:i386{a} libxcb-dri2-0:i386{a}
libxcb-dri3-0:i386{a} libxcb-glx0:i386{a} libxcb-present0:i386{a}
libxcb-sync1:i386{a} libxdamage1:i386{a} libxext6:i386{a}
libxfixes3:i386{a} libxi6:i386{a} libxml2:i386{a} libxrender1:i386{a}
libxshmfence1:i386{a} libxslt1.1:i386{a} libxss1:i386{a} libxt6:i386{a}
libxv1:i386{a} libxxf86vm1:i386{a} mysql-common{a} skype
skype-bin:i386{a} sni-qt:i386{a}
0 packages upgraded, 78 newly installed, 0 to remove and 0 not upgraded.
Need to get 58.7 MB of archives. After unpacking 206 MB will be used.
The following packages have unmet dependencies:
libgstreamer-plugins-base1.0-0 : Breaks: libgstreamer-plugins-base1.0-0:i386 (!= 1.2.4-1~ubuntu1) but 1.2.3-1 is to be installed.
libgstreamer-plugins-base1.0-0:i386 : Breaks: libgstreamer-plugins-base1.0-0 (!= 1.2.3-1) but 1.2.4-1~ubuntu1 is installed.
libgl1-mesa-dri : Breaks: libgl1-mesa-dri:i386 (!= 10.1.3-0ubuntu0.1) but 10.1.0-4ubuntu5 is to be installed.
libgl1-mesa-dri:i386 : Breaks: libgl1-mesa-dri (!= 10.1.0-4ubuntu5) but 10.1.3-0ubuntu0.1 is installed.
libfontconfig1 : Breaks: libfontconfig1:i386 (!= 2.11.0-0ubuntu4.1) but 2.11.0-0ubuntu4 is to be installed.
libfontconfig1:i386 : Depends: fontconfig-config:i386 (= 2.11.0-0ubuntu4) which is a virtual package.
Breaks: libfontconfig1 (!= 2.11.0-0ubuntu4) but 2.11.0-0ubuntu4.1 is installed.
之前尝试过 apt-get，但出现以下错误
The following packages have unmet dependencies:
skype : Depends: skype-bin
E: Unable to correct problems, you have held broken packages.
尝试使用 Synaptic 包管理器进行修复，但过滤器“损坏的包”没有显示任何包。
尝试过
sudo apt-get clean
sudo apt-get autoclean
sudo apt-get install -f
尝试在 /etc/apt/preferences 中添加以下内容，然后 sudo apt-get dist-upgrade，然后 sudo apt-get install skype：
Package: *
Pin: release a=quantal*
Pin-Priority: 2012
以上方法均无效。
答案1
在“软件和更新”中启用推荐的更新和不支持的更新，然后安装 skype 即可。
由于我禁用了推荐更新和不支持更新，因此似乎我没有某些软件包的最新版本。我只启用了安全更新。我以为我拥有最新版本的软件包，但显然我只获得了安全更新。