eclipse+pydev安装错误,windows下不行,linux一眼的错误,怎么办

An error occurred while collecting items to be installed 
 session context was:(profile=PlatformProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=). 
 Unable to read repository at http://pydev.org/updates/plugins/org.python.pydev.core_2.7.1.2012100913.jar. 
 Read timed out 
 Unable to read repository at http://pydev.org/updates/plugins/org.python.pydev.refactoring_2.7.1.2012100913.jar. 
 Read timed out