unmet dependencies while installing ROS Fuerte on Ubuntu 12.04 64-bit

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Hi all,

I have recently upgraded to Ubuntu 12.04, and naturally tried to upgrade to ROS Fuerte. My laptop has the following specifications:

Memory: 1.9 GiB Processor: Intel® Core™2 Duo CPU T8100 @ 2.10GHz × 2 Graphics: Intel® 965GM
OS Type: 64-bit

I have been installing-removing-installing-removing ROS Fuerte again and again and keep on getting the following error.

Selecting previously unselected package ros-fuerte-desktop-full. Unpacking ros-fuerte-desktop-full (from .../ros-fuerte-desktop-full_1.0.0-s1347207966~precise_amd64.deb) ... Errors were encountered while processing: /var/cache/apt/archives/libassimp-dev_2.0.863+dfsg-2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

and also the fact that Ubuntu reported error message saying

'Error: Broken count>0' This usually means that your installed packages have unmet dependencies

I upgraded libassimp via synaptic, so now I have libassimp2-d-dev, libassimp3.0 ...

Then, I tried

sudo apt-get -f install

I get the following messages.

Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following packages were automatically installed and are no longer required: kdesudo update-manager-kde Use 'apt-get autoremove' to remove them. The following extra packages will be installed: libassimp-dev The following NEW packages will be installed: libassimp-dev 0 upgraded, 1 newly installed, 0 to remove and 132 not upgraded. 5 not fully installed or removed. Need to get 0 B/94.4 kB of archives. After this operation, 470 kB of additional disk space will be used. Do you want to continue [Y/n]? Y (Reading database ... 413855 files and directories currently installed.) Unpacking libassimp-dev (from .../libassimp-dev_2.0.863+dfsg-2_amd64.deb) ... dpkg: error processing /var/cache/apt/archives/libassimp-dev_2.0.863+dfsg-2_amd64.deb (--unpack): trying to overwrite '/usr/include/assimp/Compiler/poppack1.h', which is also in package libassimp3.0-r1264-dev 3.0.1264.10-ubuntu1~precise1 No apport report written because MaxReports is reached already Errors were encountered while processing: /var/cache/apt/archives/libassimp-dev_2.0.863+dfsg-2_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

I have read a few threads on unmet dependencies, still, I'm not sure what to fix.

Thread 1: http://answers.ros.org/question/43369/unmet-dependencies-for-fuerte-desktop-full-on-1204/

Thread 2: http://answers.ros.org/question/42596/unmet-dependency-on-eigen-for-vision-opencv-now-cant-install-or-upgrade-any-fuerte-packages/

Anyhow, ROS is running whenever I call roscore, but I will not be able to create overlay, since I cannot do this (synaptic will prompt me to remove some ros related packages like ros-desktop-full etc):

sudo apt-get install python-rosinstall python-rosdep

in which I will get the following messages

The following packages have unmet dependencies: python-rosinstall : Depends: mercurial but it is not going to be installed Depends: bzr but it is not going to be installed Depends: python-vcstools but it is not going to be installed ros-fuerte-robot-model : Depends: libassimp-dev but it is not going to be installed ros-fuerte-visualization : Depends: libassimp-dev but it is not going to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

Any ideas?