apt-get找不到nginx，怎么解决?

$ sudo apt-get install nginx
Reading package lists... Done
Building dependency tree      
Reading state information... Done
The following extra packages will be installed:
  geoip-database libgeoip1 nginx-common nginx-full
Suggested packages:
  geoip-bin
The following NEW packages will be installed:
  geoip-database libgeoip1 nginx nginx-common nginx-full
0 upgraded, 5 newly installed, 0 to remove and 0 not upgraded.
Need to get 533 kB/2,132 kB of archives.
After this operation, 6,200 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main nginx-common all 1.2.1-2.2
  404  Not Found
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main nginx-full armhf 1.2.1-2.2
  404  Not Found
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main nginx all 1.2.1-2.2
  404  Not Found
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/main/n/nginx/nginx-common_1.2.1-2.2_all.deb  404  Not Found
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/main/n/nginx/nginx-full_1.2.1-2.2_armhf.deb  404  Not Found
Failed to fetch http://mirrordirector.raspbian.org/raspbian/pool/main/n/nginx/nginx_1.2.1-2.2_all.deb  404  Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

换个源的地址

系统内的软件列表旧了，先更新整个系统试试看：
sudo apt-get update; sudo apt-get upgrade