我把以前的yum文件夹保存了下来.里面有很多更新包.重装系统后我用以前的yu m 文件夹覆盖了现在的文件.用yu m 时虽然说不用再下包了,可是总是提示我Downloading Packages:
warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 4f2a6fd2
public key not available for //var/cache/yum/updates-released/packages/zip-2.3-26.3.i386.rpm不能安呀.要怎么办?