fail to update ros groovy [closed]

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I type: sudo apt-get update,then:

Ign http://extras.ubuntu.com precise/main TranslationIndex                                                       
Get:101 http://extras.ubuntu.com precise/main amd64 Packages [1,273 kB]                                          
Ign http://ppa.launchpad.net precise/main Translation-en_US                                                      
Get:102 http://extras.ubuntu.com precise/main i386 Packages [1,274 kB]                                           
Ign http://ppa.launchpad.net precise/main Translation-en                                                         
Ign http://packages.ros.org precise/main Translation-en                                                          
Get:103 http://extras.ubuntu.com precise/main Translation-en [893 kB]                                            
Ign http://extras.ubuntu.com precise/main Translation-en_US                                                      
Fetched 36.5 MB in 22s (1,656 kB/s)                                                                              
W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ppa.launchpad.net_iheartengineering_ros-support_ubuntu_dists_precise_main_binary-amd64_Packages  Hash Sum mismatch

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/ppa.launchpad.net_iheartengineering_ros-support_ubuntu_dists_precise_main_binary-i386_Packages  Hash Sum mismatch

W: Failed to fetch gzip:/var/lib/apt/lists/partial/packages.ros.org_ros_ubuntu_dists_precise_main_binary-amd64_Packages  Hash Sum mismatch

W: Failed to fetch gzip:/var/lib/apt/lists/partial/packages.ros.org_ros_ubuntu_dists_precise_main_binary-i386_Packages  Hash Sum mismatch

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_source_Sources  Hash Sum mismatch

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_binary-amd64_Packages  Hash Sum mismatch

W: Failed to fetch bzip2:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_binary-i386_Packages  Hash Sum mismatch

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

I have tried to remove the /var/lib/apt,and apt-get clean, but still . btw , I installed groovy by the ubuntu dist with turtlebot version.