rosdep update error

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Hello, I'm installing ros hydro on ubuntu 12.04 in beaglebone black, the processor is ARMv7, the OS type is 32-bit. After running "sudo rosdep init" successed, when i run "rosdep update", it shows error as follows:

ubuntu@ubuntu-armhf:~$ rosdep update
reading in sources list data from /etc/ros/rosdep/sources.list.d
Hit https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/osx-homebrew.yaml
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml]:
 <urlopen error [Errno -2] Name or service not known> 
       (https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/base.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml]:
        <urlopen error [Errno -2] Name or service not known> 
(https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/python.yaml)
ERROR: unable to process source [https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml]:
        <urlopen error [Errno -2] Name or service not known> 
(https://raw.githubusercontent.com/ros/rosdistro/master/rosdep/ruby.yaml)
Hit https://raw.githubusercontent.com/ros/rosdistro/master/releases/fuerte.yaml
Query rosdistro index https://raw.github.com/ros/rosdistro/master/index.yaml
Add distro "groovy"
Add distro "hydro"
Add distro "indigo"
ERROR: error loading sources list:
        <urlopen error <urlopen error [Errno -2] Name or service not known> 
(https://raw.github.com/ros/rosdistro/master/indigo/distribution.yaml)>

And I run "which rosdep" & "rosdep --version" & "apt-cache policy python-rosdep", the result is:

ubuntu@ubuntu-armhf:~$ which rosdep
/usr/bin/rosdep
ubuntu@ubuntu-armhf:~$ rosdep --version
0.10.30
ubuntu@ubuntu-armhf:~$ apt-cache policy python-rosdep
python-rosdep:
Installed: 0.10.30-1
Candidate: 0.10.30-1
Version table:
 *** 0.10.30-1 0
500 http://packages.namniart.com/repos/ros/ precise/main armhf Packages
100 /var/lib/dpkg/status

Please help me do with these errors.