I am using Ubuntu 14.04 with Oracle 11g. But, it is not working properly. Given the below commands and output:

```
root@madhu-Lenovo-G500:~# sqlplus

SQL*Plus: Release 11.2.0.2.0 Production on Wed Jun 25 08:51:11 2014

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

Enter user-name: system/root
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
Process ID: 0
Session ID: 0 Serial number: 0

```