A bit more Googling provided the answer. There is a magic touch in Acer laptops. You have to set an administrator password in the bios before you are allowed to disable secure boot. I can now dual boot (using the windows boot manager). The rest should be plain sailing now. Cheers Bill -----Original message----- > From:Eero Volotinen <[log in to unmask]> > Sent: Tuesday 2nd January 2018 15:21 > To: Bill Maidment <[log in to unmask]> > Cc: [log in to unmask] <[log in to unmask]> > Subject: RE: EFI installation of SL 7.4 > > I have never seen hardware without possibility to disable secureboot. > > UBuntu works with secureboot. try it first? > > Eero > > 2.1.2018 5.20 "Bill Maidment" <[log in to unmask] <mailto:[log in to unmask]>> kirjoitti:<br type="attribution" />Thanks. I thought that might be the answer. > Unfortunately, the bios (version 1.10) will not let me disable secure boot. > Maybe an older bios will? > > > -----Original message----- > > From:Eero Volotinen <[log in to unmask] <mailto:[log in to unmask]>> > > Sent: Tuesday 2nd January 2018 13:33 > > To: Bill Maidment <[log in to unmask] <mailto:[log in to unmask]>> > > Cc: [log in to unmask] <mailto:[log in to unmask]> <[log in to unmask] <mailto:[log in to unmask]>> > > Subject: Re: EFI installation of SL 7.4 > > > > enable uefi on bios and disable secure boot. > > > > Eero > > > > 2.1.2018 4.25 "Bill Maidment" <[log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask] <mailto:[log in to unmask]>>> kirjoitti:<br type="attribution" />Happy New Year everyone. > > > I am now an owner of an Acer A515-51G laptop and Im trying to install SL 7.4 in EFI mode dual boot with Win 10. > > > After lots of experiments I was only able to install in legacy mode, but that locked me out of Win 10. > > > I am trying to run mokutil, but I get an error as follows: > > > mokutil --import /etc/pki/secure-boot/SECURE-BOOT-KEY-fnal-sl7-exp-2020-08-26 > > > EFI variables are not supported on this system > > > Elsewhere, it was suggested to do modprobe efivars, but efivars does not appear to be available. > > > Any suggestions as to what to do next? > > > > > > Cheers > > > Bill Maidment > >