[ubuntu] Cant be moutned with USB

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http://ubuntuforums.org – Hey, my bad if im posting in the wrong forum.... Ubuntu Server 12.04 32bit I have this server and for awhile i was running ubuntu server os flawlessly, but then i messed up the kernels and now, I can't get anything right. I unistalled it and wiped out the hard drive. So I got the my cd-rom installation cd cannot be mounted and i forgot what i did and it worked. But i couldnt download any packages. So i wiped out the hard drive again(with Dban) and then now I can't get around the cd-rom cannot be mounted. I've tried everything! editing booting options, alt+f2 and mounting the flash drive to t (Hardware)