I started an upgrade to 12.04 but stalled during install. Now, the system boots directly into command window where I must sign in. I tried creating a bootable USB (no CD drive installed) with unetbootin and Universal USB Installer, but the system do not boot to USB first - goes directly to hard drive. I tried accessing the grub menu with all suggested commands (ex holding shift, F1, Esc, F10, F12 etc etc etc) but none worked. How can I install the new version 12.04 LTS from USB? Is there any way to install from command line? Or how can I access GRUB settings from command?
Please please please help!
PS. I am not very familiar with Linux-type systems, so step-by-step guidance would be appreciated!!!