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Let's say I installed an antivirus program for a trial period. Then I did not like it and uninstalled it. But I am definitely sure that it leaves some files, traces etc. behind. So how can I clean my Ubuntu 12.04 OS that is like did not installed the trial program at all?

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Did you install it with apt-get or dpkg? – izx Jun 21 '12 at 7:48
are you looking for the Windows' AppData folder equivalent for Ubuntu? – upapilot Jun 21 '12 at 7:49

Try running

sudo apt-get clean

sudo apt-get autoremove

from terminal

These will clear caches and remove programs and files that aren't used/needed anymore.

To remove personal information regarding the application, you would need to check in your /home

Run nautilus and enable hidden folders

Ctrl +h
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