尝试在Ubuntu的EC2实例

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我运行在Ubuntu这一行安装的东西：尝试在Ubuntu的EC2实例

sudo apt-get install pptpd

和这里的输出我得到：

Reading package lists... Done 
Building dependency tree 
Reading state information... Done 
The following extra packages will be installed: 
    bcrelay 
The following NEW packages will be installed: 
    bcrelay pptpd 
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded. 
Need to get 96.2 kB of archives. 
After this operation, 446 kB of additional disk space will be used. 
Do you want to continue [Y/n]? y 
Err http://us-west-1.ec2.archive.ubuntu.com/ubuntu/ natty/main bcrelay amd64 1.3.4-3ubuntu1 
    403 Forbidden 
Err http://us-west-1.ec2.archive.ubuntu.com/ubuntu/ natty/main pptpd amd64 1.3.4-3ubuntu1 
    403 Forbidden 
Failed to fetch http://us-west-1.ec2.archive.ubuntu.com/ubuntu/pool/main/p/pptpd/bcrelay_1.3.4-3ubuntu1_amd64.deb 403 Forbidden 
Failed to fetch http://us-west-1.ec2.archive.ubuntu.com/ubuntu/pool/main/p/pptpd/pptpd_1.3.4-3ubuntu1_amd64.deb 403 Forbidden 
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

我到底做错了什么？这是一个已知的问题？

来源

2013-08-26 l--' ' ' ' ' ' ---------' ' ' ' ' ' ' ' ' ' ' '

“E：无法获取一些档案，也许运行'apt-get的update'。 ..“ – jgb

[如何安装软件或从旧版不受支持的版本升级？]（http://askubuntu.com/questions/91815/how-to-install-software-or-upgrade-from-old-unsupported-release）应该有帮助。 –