cassandra的安装无法满足未满足的依赖性

Question

我试着安装cassandra appache.我正在按照debianpackaging wiki中的步骤进行操作.我已将这两行添加到我的sources.list中:

ola@station:~$ cat /etc/apt/sources.list | grep "apache"
deb http://www.apache.org/dist/cassandra/debian 30x main
deb-src http://www.apache.org/dist/cassandra/debian 30x main
ola@station:~$ 

我的java版本看起来也很好:

olas@station:~$ java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
olas@station:~$ 

但是,当我尝试安装它时,我收到以下错误消息:

olas@station:~$ sudo apt-get install cassandra
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:
 cassandra : Depends: openjdk-8-jre-headless but it is not installable or
                      java8-runtime but it is not installable
             Recommends: ntp but it is not going to be installed or
                         time-daemon
E: Unable to correct problems, you have held broken packages.

我怎么解决这个问题？

Answer 1

sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update
sudo apt-get install cassandra