出现的问题：
用tar 解压 tar.bz2文件出错
debian:/usr/src# tar jxf linux-2.6.26.tar.bz2
tar: bzip2: Cannot exec: No such file or directory
tar: Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error exit delayed from previous errors
解决办法
安装bzip2软件包
yum -y install bzip2