XE :: Installation Of Oracle Database 11g Express Edition On Ubuntu 12.10 LTS?

I am installed the Oracle database following the this link .

1.Downloaded 11g express edition

2.Created a new user 'oracle' under the group dba. Following steps are executed using this.

3.unzip oracle-xe-11.2.0-1.0.x86_64.rpm.zip and then Converted the rpm to the Ubuntu package

sudo alien --scripts -d oracle-xe-11.2.0-1.0.x86_64.rpm

4.Created /sbin/chkconfig file and added the entries as specified here

5.Created /etc/sysctl.d/60-oracle.conf and added the entries as specified in same link as above.

6.Below steps:

ln -s /usr/bin/awk /bin/awk
mkdir /var/lock/subsys
touch /var/lock/subsys/listener

7.sudo dpkg --install oracle-xe_11.2.0-2_amd64.deb (.deb generated in step 3)

8.sudo /etc/init.d/oracle-xe configure (left the default values as it is)

9.Set the following env variables in ~/.bashrc file

export ORACLE_HOME=/u01/app/oracle/product/11.2.0/xe
export ORACLE_SID=XE
export NLS_LANG=`$ORACLE_HOME/bin/nls_lang.sh`
export ORACLE_BASE=/u01/app/oracle
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH
export PATH=$ORACLE_HOME/bin:$PATH

[code]....

Now when exectute any SQL statements on SQLplus, i end up with the following error

SQL> select * from dual;
select * from dual
*
ERROR at line 1:
ORA-01034: ORACLE not available
Process ID: 0
Session ID: 0 Serial number: 0

I have increased the swap memory as specified in here

free -m
total used free shared buffers cached
Mem: 3901 3428 473 0 182 1988
-/+ buffers/cache: 1258 2643
Swap: 5066 0 5066