高手帮忙呀，我用虚拟机装的FC8，安装yum后用不成

chych

我用虚拟机装的FC8，安装yum后用不成，下面的是提示信息：
[root@localhost ~]# yum install yumex
Existing lock /var/run/yum.pid: another copy is running as pid 2707.
Another app is currently holding the yum lock; waiting for it to exit...

se9en

听掉系统的yumupdate服务，就ok了。

chych

谢谢，可以了，但是总是下载到100％了，就出现错误，安不上，有的干脆就连不上，我怎样更改下载源呢？错误信息如下：
[root@localhost ~]# yum install yumex
fedora                    100% |=========================| 2.1 kB    00:00     
ftp://ftp.fedora.cn/pub/fedora-c ... epodata/repomd.xml: [Errno 4] IOError: [Errno ftp error] 550 Failed to change directory.
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora-cn. Please verify its path and try again
[root@localhost ~]#