Unable to install drcsim and gazebo on Ubuntu 12.04 or 12.10

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I noticed after giving up on 12.10, and installing 12.04 that on 12.10, when doing the "apt-get update" it never lists the ROS sources as it does in 12.04. Is it possible that in 12.10, the update command isn't behaving as expected?

I'm not too familiar with apt, is it possible to force it to do an update on just those sources?

I've never seen this problem before. I would try to clean up my apt cache, remove unneeded things, and try again, e.g. something like:

sudo apt-get clean
sudo apt-get autoremove
sudo apt-get remove ros-*
sudo apt-get update
sudo apt-get install drcsim

It could be a transient problem with the ROS package repository. Try updating and then installing:

sudo apt-get update
sudo apt-get install drcsim

Of course, make sure that you've first done the required setup, as suggested by @scpeters.

Did you add the appropriate keys and repositories? These are steps 2 and 3 in the instructions at: http://gazebosim.org/wiki/1.3/install

1. Configure your Ubuntu repositories to allow "restricted," "universe," and "multiverse." You can follow the [https://help.ubuntu.com/community/Repositories/Ubuntu Ubuntu guide] for instructions on doing this.

2. Setup your computer to accept software from packages.osrfoundation.org.

   sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu precise main" > /etc/apt/sources.list.d/ros-latest.list'
   sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu precise main" > /etc/apt/sources.list.d/gazebo-latest.list'
   

3. Retrieve and install the keys for the ROS and DRC repositories.

   wget http://packages.ros.org/ros.key -O - | sudo apt-key add -
   wget http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
   

I am using ubuntu 12.04 and I have the same problem. When I do "sudo apt-get install gazebo" I get the following output:

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:
 gazebo : Depends: libboost-thread1.49.0 but it is not installable
          Depends: libboost-signals1.49.0 but it is not installable
          Depends: libboost-system1.49.0 but it is not installable
          Depends: libboost-filesystem1.49.0 but it is not installable
          Depends: libboost-program-options1.49.0 but it is not installable
          Depends: libboost-regex1.49.0 but it is not installable
          Depends: libboost-iostreams1.49.0 but it is not installable
          Depends: libcegui-mk2-0.7.6 but it is not installable
          Depends: sdformat (>= 1.4.7~) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I am stuck at this problem and really need help. I cannot re-install ubuntu for some reason.

Thanks in advance!

I'm going to guess that you have a package in the way (marked as a higher version, or forced to stay at a certain version) that the new repository wants to replace, but can't according to the rules.

12.10 I believe no longer automatically has synaptic package manager installed, but could help resolve the problem. sudo apt-get install synaptic and try to install drc via synaptic, it should show you more clearly why it cannot install. Then you can either unlock the offending package, or force the one that DRC wants.