failed to install ros-indigo-freenect-launch

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hello, i'm using Ubunti 14.04 LTS, before i installed sudo apt-get install ros-indigo-freenect-launch, it worked succesfuly. but i think after i uninstall some file with sudo apt-get remove <my package> which <my package=""> is the word that include openni and freenect in it. After that, i restart and try to install the package again <ros-indigo-freenect-launch>, it said that :

Err http://packages.ros.org/ros/ubuntu/ trusty/main ros-indigo-camera-calibration-parsers amd64 1.11.7-0trusty-20150729-0024-+0000
Could not connect to packages.ros.org:80 (140.211.166.134), connection timed out
Err http://packages.ros.org/ros/ubuntu/ trusty/main ros-indigo-camera-info-manager amd64 1.11.7-0trusty-20150729-0102-+0000
Unable to connect to packages.ros.org:http:
Err http://packages.ros.org/ros/ubuntu/ trusty/main ros-indigo-depth-image-proc amd64 1.12.14-0trusty-20150806-2000-+0000
Unable to connect to packages.ros.org:http:
Err http://packages.ros.org/ros/ubuntu/ trusty/main ros-indigo-image-proc amd64 1.12.14-0trusty-20150806-1958-+0000
Unable to connect to packages.ros.org:http:
E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-camera-calibration-parsers/ros-indigo-camera-calibration-parsers_1.11.7-0trusty-20150729-0024-+0000_amd64.deb  Could not connect to packages.ros.org:80 (140.211.166.134), connection timed out

E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-camera-info-manager/ros-indigo-camera-info-manager_1.11.7-0trusty-20150729-0102-+0000_amd64.deb  Unable to connect to packages.ros.org:http:

E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-depth-image-proc/ros-indigo-depth-image-proc_1.12.14-0trusty-20150806-2000-+0000_amd64.deb  Unable to connect to packages.ros.org:http:

E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-indigo-image-proc/ros-indigo-image-proc_1.12.14-0trusty-20150806-1958-+0000_amd64.deb  Unable to connect to packages.ros.org:http:

so, what's wrong with my system?