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I have a Samsung N120 netbook, and for some reason, cannot install Ubuntu. It says:

can't unmount /cdrom: Device resource or busy   (note that my netbook doesn't have cdrom!)
Resetting /etc/default/keyboard

Even if I wait for 15 minutes, nothing moves.

What should I do?

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Try to install via usb stick – silla Feb 3 '13 at 12:14
This is actually what I am trying to do... – Alexis Feb 3 '13 at 13:07
how did you create the live USB? – To Do Feb 3 '13 at 13:39
I downloaded the ISO and put it on my usb stick with Startup Disk Creator. – Alexis Feb 3 '13 at 13:59

It turned out that I had to reinstall the ISO to the USB flash drive. Then it worked and succeeded in the installation!

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