orocos_toolchain install git issue

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I am trying to install hector_slam on Ubuntu Lucid lynx. For installing orocos_toolchain, I am following instructions on roswiki. At a intermediate step, i am getting following error:

dst:desktop:~/robotics/experiments/orocos_toolchain$ git submodule update
Initialized empty Git repository in /home/dst/robotics/experiments/orocos_toolchain/rtt/.git/


error: Unable to get pack file https://git.gitorious.org/orocos-toolchain/rtt.git/objects/pack/pack-8d2bd25397e5fedbb908340c0536ada28f680d46.pack
Peer closed the TLS connection
error: Unable to find 526a4adc3102ba0ec72ca1135cecf669e42d1f76 under https://git.gitorious.org/orocos-toolchain/rtt.git
Cannot obtain needed object 526a4adc3102ba0ec72ca1135cecf669e42d1f76
while processing commit a03ed29d72bd8eeaa06eb5f5ae3145b26d7026e1.
error: Fetch failed.
Clone of 'https://git.gitorious.org/orocos-toolchain/rtt.git' into submodule path 'rtt' failed

Can someone tell me cause of this?

Update1:

I deleted everything. and start a fresh again. But I am still getting following error.

error: Unable to get pack file https://git.gitorious.org/orocos-toolchain/rtt.git/objects/pack/pack-8d2bd25397e5fedbb908340c0536ada28f680d46.pack
Peer closed the TLS connection
error: Unable to find 526a4adc3102ba0ec72ca1135cecf669e42d1f76 under https://git.gitorious.org/orocos-toolchain/rtt.git
Cannot obtain needed object 526a4adc3102ba0ec72ca1135cecf669e42d1f76
while processing commit a03ed29d72bd8eeaa06eb5f5ae3145b26d7026e1.
error: Fetch failed.
Clone of 'https://git.gitorious.org/orocos-toolchain/rtt.git' into submodule path 'rtt' failed

Update2: i deleleted everything and started from fresh. Following is the output.

dst@dst-desktop:~/robotics/experiments$ git clone http://git.gitorious.org/orocos-toolchain/orocos_toolchain.git
Initialized empty Git repository in /home/dst/robotics/experiments/orocos_toolchain/.git/
dst@dst-desktop:~/robotics/experiments$ git clone http://git.mech.kuleuven.be/robotics/rtt_ros_integration.git
Initialized empty Git repository in /home/dst/robotics/experiments/rtt_ros_integration/.git/
remote: Counting objects: 624, done.
remote: Compressing objects: 100% (395/395), done.
remote: Total 624 (delta 392), reused 339 (delta 208)
Receiving objects: 100% (624/624), 97.34 KiB | 38 KiB/s, done.
Resolving deltas: 100% (392/392), done.
dst@dst-desktop:~/robotics/experiments$ git clone http://git.mech.kuleuven.be/robotics/rtt_ros_comm.git
Initialized empty Git repository in /home/dst/robotics/experiments/rtt_ros_comm/.git/
remote: Counting objects: 22, done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 22 (delta 9), reused 0 (delta 0)
Unpacking objects: 100% (22/22), done.
dst@dst-desktop:~/robotics/experiments$ 
dst@dst-desktop:~/robotics/experiments$ git clone http://git.mech.kuleuven.be/robotics/rtt_common_msgs.git
Initialized empty Git repository in /home/dst/robotics/experiments/rtt_common_msgs/.git/
remote: Counting objects: 83, done.
remote: Compressing objects: 100% (80/80), done.
remote: Total 83 (delta 48), reused 0 (delta 0)
Unpacking objects: 100% (83/83), done.
dst@dst-desktop:~/robotics/experiments$ git clone http://git.mech.kuleuven.be/robotics/rtt_geometry.git
Initialized empty Git repository in /home/dst/robotics/experiments/rtt_geometry/.git/
remote: Counting objects: 223, done.
remote: Compressing objects: 100% (219/219), done.
remote: Total 223 (delta 115), reused 0 (delta 0)
Receiving objects: 100% (223/223), 44.48 KiB | 46 KiB/s, done.
Resolving deltas: 100% (115/115), done.
dst@dst-desktop:~/robotics/experiments$ roscd orocos_toolchain
dst@dst-desktop:~/robotics/experiments/orocos_toolchain$ git submodule init
Submodule 'log4cpp' (https://git.gitorious.org/orocos-toolchain/log4cpp.git) registered for path 'log4cpp'
Submodule 'ocl' (https://git.gitorious.org/orocos-toolchain/ocl ...