Error downloading packages: kernel-headers-3.12.8-300.fc20.x86_64

os: fedora 20

when i  execute


yum install elfutils-libelf-devel gcc gcc-c++ glibc-devel glibc-headers ksh libaio-devel libstdc++-devel unixODBC unixODBC-devel

there's error like this : 

Error downloading packages:   kernel-headers-3.12.8-300.fc20.x86_64


you can fix this by this :


    su -
    setenforce 0
    yum clean expire-cache
    yum --enablerepo=updates-testing update selinux-policy\*
    setenforce 1


reference: https://lists.fedoraproject.org/pipermail/users/2014-January/445588.html

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