打開 /etc/apt/sources.list 添加下面兩行
Ubuntu ：
deb http://nginx.org/packages/ubuntu/ lucid nginx
deb-src http://nginx.org/packages/ubuntu/ lucid nginx
debian：
deb http://nginx.org/packages/debian/ squeeze nginx
deb-src http://nginx.org/packages/debian/ squeeze nginx
更新包、安裝nginx
apt-get update
apt-get install nginx
提示：
Configuration file `/etc/nginx/nginx.conf'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : background this process to examine the situation
The default action is to keep your current version.
*** nginx.conf (Y/I/N/O/D/Z) [default=N] ?
這時輸入N，保留之前的nginx.conf配置。
完成安裝後，重啟nginx
service nginx restart
完成更新，可以輸入以下命令查看當前版本。
nginx -v
