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:
build-essential : Depends: dpkg-dev (>= 1.13.5) but it is not going to be installed
libgmp3-dev : Depends: libgmp-dev (= 2:5.0.2+dfsg-2ubuntu1) but it is not going to be installed
libmpc-dev : Depends: libmpc2 (= 0.9-4) but 0.9-4build1 is to be installed
Depends: libgmp-dev but it is not going to be installed
libmpfr-dev : Depends: libgmp-dev but it is not going to be installed
Depends: libmpfr4 (= 3.1.0-3ubuntu2) but 3.1.0-3ubuntu3 is to be installed
libncurses5-dev : Depends: ncurses-bin (= 5.9-4) but 5.9-10ubuntu1 is to be installed
libncursesw5-dev : Depends: ncurses-bin (= 5.9-4) but 5.9-10ubuntu1 is to be installed
libx11-dev : Depends: libx11-6 (= 2:1.4.99.1-0ubuntu2.2) but 2:1.5.0-1 is to be installed
Depends: libxau-dev (>= 1:1.0.0-1) but it is not going to be installed
Depends: libxdmcp-dev (>= 1:1.0.0-1) but it is not going to be installed
Depends: libxcb1-dev but it is not going to be installed
Recommends: libx11-doc but it is not going to be installed
zlib1g-dev : Depends: zlib1g (= 1:1.2.3.4.dfsg-3ubuntu4) but 1:1.2.7.dfsg-13 is to be installed
E: Unable to correct problems, you have held broken packages.

...try...