WTG! The message was probably due to the previous configuration information being stored on the hard-drive that was still connected (ie: not the drive with Windows 10). Something to make note is that UEFI usually stores its configuration information in a small partition known as the EFI partition. It is usually hidden from everyday file utilities; but you can see it with Disk/Partition utilities. The GRUB2 boot system (the standard boot-loader used in most GNU/Linux distros) knows about this EFI partition and will usually mount it under its boot/grub directory tree as "efi" or something like that; hence, this way GRUB2 can work in harmony with EFI boot-up protocols and manipulate the EFI configuration, if necessary.
Sincerely, Frank On Fri, 2016-03-04 at 19:47 +0000, j...@messier.ca wrote: > I solved it, after some advice from yesterday's meeting. The first > (and easiest) that I tried was to disconnect the Windows hard disk, > and retry installing Ubuntu 15.10. I was surprised by a message > about > possible other UEFI installed OSes, although there were none. > > But from this message, I understood that Ubuntu knew (and assumed > complied to) UEFI. I was not sure until then, as I saw articles on > modifying an Ubuntu ISO to make it UEFI-compliant. Anyway, I left > the > Windows disk disconnected, but re-enabled the UEFI. Boot Ubuntu > ISO, > and did not get htis error message anymore. So I shutdown and > actually > re-connected the Windows disk, and tried the actual install of > Ubuntu, > as I tried so many times previously. It went actually all the way, > no > problem. > > So the lesson: Do not assume UEFI is gonna cause you grief > immediately. Do not disable it and try first. I was so sure that > UEFI > would cause issues, that I tried to disable it first, while I > should > have left it alone. > > > > > > > > > On Tue, 2016-03-01 at 22:12 +0000, j...@messier.ca wrote: > > > > > > > > Everything goes fine until the very end, when installing the > > > > bootloader. I get an error message saying that it cannot write > > > > the > > > > bootloader. None of the three options worked, actually. The > > > > first > > > > was > > > > to retry on another disk/partition, the second was to install > > > > no > > > > bootloader whatsoever, and the third was to cancel the install. > > > > BUT > > > > NO > > > > OPTION ACTUALLY WORKED. They all came back to the same error > > > > message. > > > > > > > > Reboot from the USB key, and try to manually run grub-install > > > > /dev/sda. Also get an error message. > > > > > > > > Anyone has an idea what I did wrong ? I set the motherboard to > > > > be > > > > in > > > > Legacy mode. This is a recent ASUS motherboard, on a Intel Core > > > > i3 > > > > system. > > > Hi Jean-Francois, > > > > > > Newer PC builds and kits might be using UEFI booting protocols > > > instead > > > of the older legacy BIOS protocols; hence, grub2 (ie: not legacy > > > GRUB > > > grub) does have provisions for booting from a UEFI system. > > > > > > This means that you have can either disable the UEFI mode onboard > > > or > > > install a Linux distribution that has the necessary certificates > > > to > > > allow UEFI secure bootup. Disabling UEFI would probably result > > > in > > > problems in booting Windows Bootloader, so it is probably not the > > > best > > > solution in your case, unless you want to go all Linux and legacy > > > boot. > > > There are other workarounds which can defeat the UEFI, but they > > > are > > > very klutzy and do reduce security, so it really would be at your > > > discretion whether you can handle those risks. > > > > > > The best solution is to use a Linux distribution that has the > > > necessary > > > UEFI (SecureBoot) certificates: I believe some flavours of Ubuntu > > > have > > > this and I know that Fedora 23 has it (Does anybody else know of > > > which > > > distros can boot UEFI transparently?) > > > > > > HTH (Hope this helps) > > > > > > Sincerely, > > > Frank > > > > > > > > > _______________________________________________ > > > Linux mailing list > > > Linux@lists.oclug.on.ca > > > http://oclug.on.ca/mailman/listinfo/linux _______________________________________________ Linux mailing list Linux@lists.oclug.on.ca http://oclug.on.ca/mailman/listinfo/linux
