This is an Easy and Step-by-Step Guide to Install the Oracle 11g R2 Database on Linux Mint 13 Maya Cinnamon 32bit/64bit Desktop.
Ubuntu-like Systems are Not in the List of Oracle 11g Database Supported OS So you should Be Carefull and Use It At Most for Development and Not As Production Database Server!
The Guide Include All the Essentials Commands and Basic Screenshots of the Installation Process.
The Process is somewhat Extended and Advanced so it Demand some Basic Command Line Confidence.
Now Relax and Take the Time of Reading, Understanding and Executing Carefully the Instructions Contained here.
To the Post Bottom you Find Link to Oracle 11g Database Installation Troubleshooting Guides.

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After you Should Access the "Enterprise Manager" on Browser by the URL shown on the Last Screen. On a Localhost for Example you Should Access the Enterprise Manager by the Address:
https://127.0.0.1:1158/emAnd you can Login with: User Name: SYS Password: oracleDatabasePassword From the Drop-down below Select >> Connect as SYSDBA You Should be Able to Access the Database by the Enterprise Manager!
How Managing, Start & Stop Oracle 11g R2 Database by SQLPlus Commands
SQLPlus Oracle 11g DB Quick-Start
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