我可以使用以下命令在我的ubuntu 14.04 LTS台式机上安装nginx的最新稳定版本（1.8.0）。
sudo add-apt-repository ppa:nginx/stable
sudo apt-get update
sudo apt-get install nginx
但是当我在DragonBoard 410c上尝试相同的命令时，它会显示以下错误。
sudo apt-get install nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
nginx : Depends: nginx-full (>= 1.8.0-1+vivid1) but it is not going to be installed or
nginx-light (>= 1.8.0-1+vivid1) but it is not going to be installed or
nginx-extras (>= 1.8.0-1+vivid1) but it is not going to be installed
Depends: nginx-full (< 1.8.0-1+vivid1.1~) but it is not going to be installed or
nginx-light (< 1.8.0-1+vivid1.1~) but it is not going to be installed or
nginx-extras (< 1.8.0-1+vivid1.1~) but it is not going to be installed
W: Duplicate sources.list entry http://ports.ubuntu.com/ubuntu-ports/ vivid/main arm64 Packages (/var/lib/apt/lists/ports.ubuntu.com_ubuntu-ports_dists_vivid_main_binary-arm64_Packages)
W: Duplicate sources.list entry http://ports.ubuntu.com/ubuntu-ports/ vivid/universe arm64 Packages (/var/lib/apt/lists/ports.ubuntu.com_ubuntu-ports_dists_vivid_universe_binary-arm64_Packages)
W: You may want to run apt-get update to correct these problems
E: Unable to correct problems, you have held broken packages.
我们在DragonBoard 410c上发布了linbuo的Ubuntu 15.04（生动）版本。