Error in signature verification when running apt-get update [closed]

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I'm trying to install groovy on Ubuntu 12.04 as detailed on this page http://ros.org/wiki/groovy/Installation/Ubuntu. ON running apt-get update, it fails with errors:

Fetched 199 B in 6s (31 B/s)

....    
Reading package lists... Done
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: <a href="http://packages.ros.org">http://packages.ros.org</a> precise Release: The following signatures were invalid: BADSIG 5523BAEEB01FA116 ROS Builder <<a href="mailto:rosbuild@ros.org">rosbuild@ros.org</a>>

W: Failed to fetch <a href="http://packages.ros.org/ros/ubuntu/dists/precise/Release">http://packages.ros.org/ros/ubuntu/dists/precise/Release</a>  

W: Some index files failed to download. They have been ignored, or old ones used instead.

I do have the ROS Builder signature in the list:

root@ankur-ws:/etc/apt/sources.list.d# apt-key list
/etc/apt/trusted.gpg
--------------------
pub   1024D/437D05B5 2004-09-12
uid                  Ubuntu Archive Automatic Signing Key <<a href="mailto:ftpmaster@ubuntu.com">ftpmaster@ubuntu.com</a>>
sub   2048g/79164387 2004-09-12

pub   1024D/FBB75451 2004-12-30
uid                  Ubuntu CD Image Automatic Signing Key <<a href="mailto:cdimage@ubuntu.com">cdimage@ubuntu.com</a>>

pub   4096R/C0B21F32 2012-05-11
uid                  Ubuntu Archive Automatic Signing Key (2012) <<a href="mailto:ftpmaster@ubuntu.com">ftpmaster@ubuntu.com</a>>

pub   4096R/EFE21092 2012-05-11
uid                  Ubuntu CD Image Automatic Signing Key (2012) <<a href="mailto:cdimage@ubuntu.com">cdimage@ubuntu.com</a>>

pub   1024D/3E5C1192 2010-09-20
uid                  Ubuntu Extras Archive Automatic Signing Key <<a href="mailto:ftpmaster@ubuntu.com">ftpmaster@ubuntu.com</a>>

pub   1024D/B01FA116 2009-12-24
uid                  ROS Builder <<a href="mailto:rosbuild@ros.org">rosbuild@ros.org</a>>
sub   2048g/8F3611A0 2009-12-24

root@ankur-ws:/etc/apt/sources.list.d#

If I proceed with the install:

sudo apt-get install ros-groovy-desktop-full

it gives a lot of 404 errors, mostly for the ros-groovy packages:

Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-tf2-kdl amd64 0.3.6-0precise-20130326-0223-+0000  
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-tf2-tools amd64 0.3.6-0precise-20130326-0222-+0000
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-geometry-experimental amd64 0.3.6-0precise-20130326-0326-+0000
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-robot-model-tutorials amd64 0.1.2-s1364219092~precise
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-diagnostic-common-diagnostics amd64 1.7.10-0precise-20130326-0219-+0000
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ros-groovy-diagnostic-analysis amd64 1.7.10-0precise-20130326-0219-+0000
  404  Not Found
Err <a href="http://packages.ros.org/ros/ubuntu/">http://packages.ros.org/ros/ubuntu/</a> precise/main ...