how to uninstall oracle database from Ubuntu 14.04

i used this link to install oracle database 12c se2.
http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/11g/r1/prod/install/dbinst/dbinst.htm
i know that this link is 11g but i just used this steps.
now i need to uninstall it, what should i do ?
i tried to search about that but i can't find what first step and from where should i begain

Uninstall Oracle 11g XE on Linux Ubuntu

The following will completely uninstall and remove Oracle 11g XE: Open a terminal session and login as user root:

$ sudo su

Enter the following:

# /etc/init.d/oracle-xe stop
# dpkg --purge oracle-xe
# rm -r /u01/app
# rm /etc/default/oracle-xe

# update-rc.d -f oracle-xe remove
# update-rc.d -f oracle-mount remove
# update-rc.d -f oracle-shm remove

Source: https://community.oracle.com/thread/2303639

Stop all servers
rm -Rf $ORACLE_HOME
sudo cd $ORACLE_BASE && rm -Rf admin doc jre o*
rm /etc/oratab /etc/emtab

And that should be it unless you added personal directories outside these locations.

how to uninstall oracle database from Ubuntu 14.04

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