Как решить проблемы со следующими пакетами

Я пытался установить AmberTool. Но когда я следовал, система руководства по установке сказала мне устанавливать следующие зависимости:

sudo apt-get install csh flex gfortran g++ xorg-dev \
     zlib1g-dev libbz2-dev patch python-tk python-matplotlib

Это дало мне следующие ошибки:

The following packages have unmet dependencies:

 gfortran : Depends: gfortran-4.6 (>= 4.6.3-1~) but it is not going to be installed
 libbz2-dev : Depends: libbz2-1.0 (= 1.0.6-1) but 1.0.6-4 is to be installed
 xorg-dev : Depends: libfontenc-dev but it is not going to be installed

            Depends: libfs-dev but it is not going to be installed
            Depends: libice-dev but it is not going to be installed
            Depends: libsm-dev but it is not going to be installed
            Depends: libxaw7-dev but it is not going to be installed
            Depends: libxcomposite-dev but it is not going to be installed
            Depends: libxcursor-dev but it is not going to be installed
            Depends: libxfont-dev but it is not going to be installed
            Depends: libxft-dev but it is not going to be installed
            Depends: libxinerama-dev but it is not going to be installed
            Depends: libxmu-dev but it is not going to be installed
            Depends: libxmuu-dev but it is not going to be installed
            Depends: libxpm-dev but it is not going to be installed
            Depends: libxrandr-dev
            Depends: libxrender-dev but it is not going to be installed
            Depends: libxres-dev but it is not going to be installed
            Depends: libxss-dev but it is not going to be installed
            Depends: libxt-dev but it is not going to be installed
            Depends: libxtst-dev but it is not going to be installed
            Depends: libxv-dev but it is not going to be installed
            Depends: libxvmc-dev but it is not going to be installed
            Depends: libxxf86dga-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Я действительно работал sudo apt-get update прежде, чем выполнить это, но это ничего не изменило.

Как я могу зафиксировать те пакеты и установить эти зависимости?