I did the "Clean drive fully" option, it took a whole night to run! After that I could change the Security Boot to "Disable" in the Boot Section of the UEFI-BIOS. I tried a lot (set supervisor password in BIOS.) but in the end I guess the Windows 8 factory reset did it (described here: ). With secure boot enabled, the attempt to install Ubuntu 13.04 from LiveCD ended with the message: "DVDRAM has been blocked by the current security policy"and I could not boot the LiveCD. The Secure Boot option was just gray and could not be reached with up/down keys. I was at the same dead end: I could not disable secure boot in the UEFI-mode in the BIOS of an Acer Travelmate P253-E with pre-installed Windows 8. Dual Boot Windows 8 and Ubuntu 13.04 on Acer TravelMate
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