我虚拟机上的ubuntu能上网 apt-get update命令

我虚拟机上的ubuntu能上网 apt-get update命令执行之后W: Failed to fetch http://cn.archive.ubuntu.com/ubu ... e/source/Sources.gz  404  Not Found

W: Failed to fetch http://security.ubuntu.com/ubunt ... ry-i386/Packages.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... ry-i386/Packages.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... n/source/Sources.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... d/source/Sources.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... ry-i386/Packages.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... e/source/Sources.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... ry-i386/Packages.gz  404  Not Found [IP: 91.189.92.184 80]

W: Failed to fetch http://security.ubuntu.com/ubunt ... e/source/Sources.gz  404  Not Found [IP: 91.189.92.184 80]

E: Some index files failed to download, they have been ignored, or old ones used instead.

root@asqwlcy-desktop:/home/asqwlcy# apt-get install vsftpd
Reading package lists... Done
Building dependency tree      
Reading state information... Done
E: Couldn't find package vsftpd

你是说 ping 网络？

回复 2# 爱喝水的鱼
换源是什么意思？

回复 5# 爱喝水的鱼


    能告诉我怎样操作？新手太笨了

回复 7# 爱喝水的鱼


    这个飞凌家提供的软件，如果换成国内的软件，有可能出现很多问题。我是个新手，对于出现的问题不知出那下手。