you can fix this error not only in ubuntu 14.04 but also in ubuntu 12.04 / 12.10.
Ans :- To give the sudo permission to a oracle we need to add the user to the file /etc/sudoers file.
Step1 :- sudo su (logging as a Root)
Step2 :- sudo nano /etc/sudoers or sudo vi /etc/sudoers
Step3 :- Add Line
oracle ALL = (ALL)ALL (under the user privilege specification section)
Step4 :- Save and Exit
Note :- In place of Ubuntu you can right any name, just replace it
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