在ROS安装中出现的问题
在重装系统后，虚拟机里的ubuntu也没了，于是我重新从网上下载了一个ubuntu14.1，安装好后。又来安装ROS，可是一直提示：The following packages have unmet dependencies:
ros-indigo-desktop-full : Depends: ros-indigo-desktop but it is not going to be installed
Depends: ros-indigo-simulators but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
然后我折腾了半天，也不能解决。后来我又重新下载了ubuntu14.04，按照http://wiki.ros.org/indigo/Installation/Ubuntu完美安装，一点问题都没有。
您好！ 请教一下，我在安装环境时始终没有成功，系统是14.04，也是按照http://wiki.ros.org/indigo/Installation/Ubuntu安装的。
fandong@fandong:~$ sudo apt-get install ros-jade-desktop-full
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:
ros-jade-desktop-full:i386 : Depends: ros-jade-desktop:i386 but it is not going to be installed
Depends: ros-jade-perception:i386 but it is not going to be installed
Depends: ros-jade-simulators:i386 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
fandong@fandong:~$ 您好！我在安装ros环境时一直遇到问题，没有成功，使用的ubuntu14.04，也是按照http://wiki.ros.org/indigo/Installation/Ubuntu来进行的，但是遇到下面的问题
fandong@fandong:~$ sudo apt-get install ros-jade-desktop-full
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:
ros-jade-desktop-full:i386 : Depends: ros-jade-desktop:i386 but it is not going to be installed
Depends: ros-jade-perception:i386 but it is not going to be installed
Depends: ros-jade-simulators:i386 but it is not going to be installed
E: Unable to correct problems, you have held broken packages. 我也遇到了同样的问题，后来找到了解决的方法，简单说就是
sudo dpkg --clear-avail
sudo dpkg --configure -a
sudo apt-get install -f
sudo apt-get update
sudo apt-get upgrade
具体内容可以看我写的：
http://my.oschina.net/lvzht/blog/645873
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