Ubuntu 安装datastax cassandra 2.0时出错

我无法在Ubuntu上安装datastax cassandra 2.0。我可以安装2.1没有任何问题，但我需要运行2.0.9。我正在遵循这些步骤，我可以做些什么来安装2.0吗

echo "deb http://debian.datastax.com/community stable main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
curl -L http://debian.datastax.com/debian/repo_key | sudo apt-key add -
sudo apt-get update
sudo apt-get -y install  dsc20

错误是：

$ sudo apt-get -y install  dsc20
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:
 dsc20 : Depends: cassandra (= 2.0.10) but 2.1.0-2 is to be installed
E: Unable to correct problems, you have held broken packages.

给你：

sudo apt-get install dsc20 cassandra=2.0.10 -V 

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这仍然给了我同样的问题。将其更改为cassandra=2.0.*已修复。如图所示