升级mongodb没有效果仍然显示旧版本

以下是我用来将我的mongodb版本从2.6.9升级到最新版本的命令，但它仍然显示了以前的版本.让我知道升级过程中我做错了什么.问题是mongod -version仍然显示升级后安装的旧版本.

我提到的文件-Mongodb Docs

我遵循的步骤-

• sudo apt key adv--keyserverhkp://keyserver.ubuntu.com:80--recv 7F0CEB10
• echo"deb http://repo.mongodb.org/apt/ubuntu"(lsb_release-sc)//mongodb org/3.0 multiverse"| sudo tee/etc/apt/sources.列表d/mongodb-org-3.0.列表
• 更新源
• sudo apt get install-y mongodb org

结果-

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be upgraded:
  mongodb-org
1 upgraded, 0 newly installed, 0 to remove and 139 not upgraded.
Need to get 3,608 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://repo.mongodb.org/apt/ubuntu/ trusty/mongodb-org/3.0/multiverse mongodb-org amd64 3.0.2 [3,608 B]
Fetched 3,608 B in 0s (18.3 kB/s)      
(Reading database ... 298790 files and directories currently installed.)
Preparing to unpack .../mongodb-org_3.0.2_amd64.deb ...
arg: upgrade
Unpacking mongodb-org (3.0.2) over (2.6.9) ...
Setting up mongodb-org (3.0.2) ...

在这之后，我重新开始了这项服务——sudo service mongod restart

但它仍然向我展示了2.6.9版，让我知道我做错了什么..或者错过了任何一步？