我在我的 ubuntu 12.04 服务器上安装了 nginx 1.1.19。
现在我想将其升级到1.7.6，我添加了nginx_signing.keynginx的apt源，然后运行sudo apt-get install --only-upgrade nginx。但我收到了这个错误：
The following packages were automatically installed and are no longer required:
libjpeg8 libgd2-noxpm nginx-full libjpeg-turbo8 nginx-common
Use 'apt-get autoremove' to remove them.
The following packages will be upgraded:
nginx
1 upgraded, 0 newly installed, 0 to remove and 168 not upgraded.
Need to get 0 B/466 kB of archives.
After this operation, 904 kB of additional disk space will be used.
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