yum命令安装软件时出现"Exiting on user cancel"错误的解决办法

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解决办法：修改/usr/lib/python2.7/site-packages/urlgrabber/grabber.py文件，注释掉两行代码。如下：

elif errcode in (42, 55, 56):
　　# this is probably wrong but ultimately this is what happens
　　# we have a legit http code and a pycurl 'writer failed' code
　　# which almost always means something aborted it from outside
　　# since we cannot know what it is -I'm banking on it being
　　# a ctrl-c. XXXX - if there's a way of going back two raises to
　　# figure out what aborted the pycurl process FIXME
　　raise KeyboardInterrupt

修改后：

#elif errcode in (42, 55, 56):
　　# this is probably wrong but ultimately this is what happens
　　# we have a legit http code and a pycurl 'writer failed' code
　　# which almost always means something aborted it from outside
　　# since we cannot know what it is -I'm banking on it being
　　# a ctrl-c. XXXX - if there's a way of going back two raises to
　　# figure out what aborted the pycurl process FIXME
　　#raise KeyboardInterrupt