I have a computer that had Hardy Heron installed, I wanted to erase everything and install Ubuntu 12.04.2 LTS (Precise Pangolin).
the computer has no cd-drive, I tried making a bootable usb with UNetbootin but the computer would not boot from usb.
I ended up installing it following these instructions: https://help.ubuntu.com/community/In...llFromInternet.
It was going fine until the GRUB installation, it gave me "GRUB cannot install" error so I choose to install LILO instead and finished the installation.
when it booted it showed this

VFS: Cannot open root device "sdb1" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown wn-block (0,0)
Pid: 1, comm:swapper/0 Not tainted 3.2.0-39-generic-pac #62-Ubuntu
I searched the forums but most solutions required a live cd and the computer has no cd-drive.
Do I need to buy a new cd-drive or is there any other way to solve the issue?

I am a beginner to linux in general.