Becky asked:
“…I am running Ubuntu Linux. I want to wipe my hard drive. How do i do that?…”
I’m assuming that you don’t have another computer you can plug that hard drive in? Additionally, you cannot wipe a hard drive if you have no OS to run the software. And finally, I assume by wiping, that you are referring to writing 0′s and 1′s via several passes over the hard drive.
I have come across an Open Source solution that does this, it’s called Darik’s Boot And Nuke.

In general, you download the image from here: http://www.dban.org/download, burn it to a CD and boot off that CD. Follow the prompts and select your appropriate configuration options.
Note: If there is data on the hard drive that you wish to keep, make yourself a seperate backup on some other media BEFORE you wipe the drive.

DBAN is the best.
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