My new computer is an Acer xc600. The first thing i did was to delete the Windows 8 operating system, format the hd and installed ubuntu 12.10. No big problems so far.
But now the computer is totaly locked. When I start I get a red frame with the text "Secure boot violation. Invalid signature detected. Check secure boot policy in set up." There is also a OK-buttom I can't click.
I don't know how to reach setup. F12, F11 and so on doesn't work.
Can't start from usb or cd either, because it's not seems possible to make a choise when start. I also tried pmagic with the same result.
I am stucked. Any help here?