I have an issue with upgrading my laptop to ubuntu 18.04 It's slow and not working well in many things( sometimes restarts on its on, slow while using it, freezes, does not detect the usb) all of these things, not always happining, but randomly. I've tried to reinstall it many times, but the result is same. So when I reinstall it, I found that still there are some files in the directory which I've downloaded before! So I've decided to wipe the hard disk with zeroes using dd command. And suddenly when I type it in terminal.. I've got black screen with only hyphen sign in it for almost 30 minutes now. So my question is.. Is that what I supposed to get? And how long it does usually take to finish?
Given:: Using bootable usb stick. And 500gb hard drive which I'm trying to wipe with zeroes.