I experiment with secure boot. I enabled it on Thinkpad X230 and could (and still can) boot Ubuntu 12.04.2 (64 bit) from USB stick. I then installed Ubuntu (left only the first NTFS partition with recovery for windows 7). Now I can't boot Ubuntu from my harddrive. Shouldn't I be able to boot Ubuntu? Any idea on how to use Ubuntu 12.04.2 with Secure Boot enabled? Do I encounter a bug or a feature?