Ubuntu 12.04.5 LTS 安装hhvm 3.5报错，该如何处理依赖？?报错

安装环境：
root@ubuntu :/# uname -r
3.2.0-29-generic
root@ubuntu :/# sudo lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04.5 LTS
Release: 12.04
Codename: precise

hhvm版本:
root@ubuntu :/# apt-cache showpkg hhvm
Package: hhvm
Versions: 
3.5.0~wheezy
3.5.0~precise

安装hhvm的时候报出以下错误：
root@ubuntu :/# apt-get install hhvm
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:
 hhvm : Depends: libmemcached10 but it is not installable
        Depends: libcurl3 (>= 7.26.0) but 7.22.0-3ubuntu4.12 is to be installed
        Depends: libmagickwand5 but it is not installable
        Depends: libmemcachedutil2 but it is not installable
E: Unable to correct problems, you have held broken packages.

该怎么解决这几个依赖，有人可以帮忙指点下吗？