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Thread: Linux & Win & UEFI dual booting problem

  1. #11
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    Oct 2012
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    Re: Linux & Win & UEFI dual booting problem

    So I am stuck with each OS knowing the other is there?

    What happens if I unplug the flash drive that I plan on having linux on for the interim? Or the flash drive fails?

    Does that mean Windows won't boot?

    This is so confusing to say the least.

    If only linux would recognize and support mobile broadband dongles I would have a much easier time with this. No win7 needed . . .

    The risk of having each OS knowing the other exists can open things up for loads of problems, especially since windows is easy to infest with malware that can prevent either from working.

    I will certainly check into the links you provided. thanks.

    Note: I have two laptops to fix this problem. I don't want my wife to use windows even though she loves the cutzie features.

    If only I could pull my hard drive out, install linux to a flash drive, plug my hard drive back in then choose which to boot from when I turn on the computer.

    I tried that but windows forced a reformat and reinstall. Then linux wouldn't work.

    This problem doesn't exist when using a live version of linux.
    But that is too much hassle and too slow.

  2. #12
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    Kubuntu

    Re: Linux & Win & UEFI dual booting problem

    I am afraid dual booting is a bit more advanced. And UEFI is new so there may be cases where you have to use commands to do things.

    But we usually post terminal commands as Linux has many gui's and each is different on how to do things, where the terminal command is the same. Most cases you should just have to copy & paste which does not require really learning the commands any more than clicking on menus.

    I still do not understand what you did that Windows had to reinstall. Just plugging drive back in should not have caused that.

    My suggestions have always been to have Windows on one drive and fully bootable without any other drive. But you can chainload from grub's menu to boot Windows. That also works with UEFI. And on my system a flash drive is seen as another hard drive to boot, so there is no real difference.

    UEFI dual boot two drives
    http://ubuntuforums.org/showthread.php?t=2031836
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #13
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    Re: Linux & Win & UEFI dual booting problem

    This still doesn't tell me how to dual boot and it requires a windows full install cd/dvd to do it.

    http://i.technet.microsoft.com/dynimg/IC514412.png

    Is there a linux pic that shows how linux uses uefi?

    Or are we all still at the mercy of microsoft just to use a computer?
    I am scared to try messing with 'wipe the disk' instructions on that page. If I mess up i won't have a computer, warranty, or internet.

    Is there a program i can get that does all this stuff for me??

  4. #14
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    Re: Linux & Win & UEFI dual booting problem

    If you have Windows install in UEFI mode on a gpt drive and have additional space, all you have to do is boot the 64bit version of Ubuntu in UEFI mode. Then you an install it just like any other install. Grub goes into the efi partition not the MBR. You can use defaults of / (root) and swap or create additional /home or other partitions depending on how you install.

    Many of these users had some issues and that is why they had a thread, but worked thru them.

    https://help.ubuntu.com/community/UEFI
    https://help.ubuntu.com/community/UE..._into_EFI_mode
    How Boot-Repair fixes a Ubuntu with grub-pc with efi Windows
    http://ubuntuforums.org/showpost.php...&postcount=516
    UEFI installs in BIOS, Boot-Repair to fix
    http://ubuntuforums.org/showthread.php?t=2048457
    http://ubuntuforums.org/showthread.php?t=2058453

    GUIDE: (U)EFI installation Also full install post #52 superfreak on pg.6
    http://ubuntuforums.org/showthread.php?t=1958383

    UEFI dual boot two drives
    http://ubuntuforums.org/showthread.php?t=2031836
    UEFI boot Issue with Alienware X51
    http://ubuntuforums.org/showthread.php?t=2039451
    UEFI dual boot trouble: Win7x64 - Ubuntu 12.04 LTS amd64
    http://ubuntuforums.org/showthread.php?t=2003442
    UEFI screen shots with choice to boot
    http://ubuntuforums.org/showthread.p...7#post12030957
    Dual Video Intel & nVidia
    http://ubuntuforums.org/showthread.php?t=1994622
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  5. #15
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    Oct 2012
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    Re: Linux & Win & UEFI dual booting problem

    I was trying to have manual control over which OS I waned to boot from, not use grub or win bootloader or uefi bootloader to do it.

    If one thing happens then neither might not be bootable. And since uefi is new I have no clue as to how to fix the problem other then if i am lucky use windows restore partition and lose everything.

    Also, I would have rather had a choice in Linux OS's and not be stuck with ubuntu or any other one specifically.

    The way I did it before I could just unplug one drive R/R the other one ad switch at a whim.

    If I had ubuntu on a flash drive and win7 on a hard drive then removed the flash drive what happens then?
    Will windows force me to R/R the hard drive because of a configuration change?

    I must preserve windows at all costs while the computer is under warranty. Or they will charge me to re install windows to put it back to factory specs.

    Note: I tried Knoppix once - it caught my power supply on fire immediately.

    Is there a way to fix uefi so as to ignore any other hard drive or OS on a different boot medium? Or write protect uefi so that no changes could be made and thus preserve the windows drive?

    I know it ignores live cd's/dvd's.

    Also, just a thought - what happens if I want to save a file to the windows hard drive when running a live Linux OS?

    Just by accessing the drive could cause problems, right?

    I looked in my BIOS.here is a setting to turn disable UEFI.

    If I do, what happens then? Could I dual boot the way I want without windows screaming for a R/R?

    It is beginning to look like I get a choice of one or the other and I am not comfortable with Microsoft choosing that for me.

    Again, if Linux would even recognize my internet usb dongle there would be a chance that I could get it to work.

    I am not windows hater or a linux lover. I want something that works with the lest amount of problems. So that means Linux is the winner.

    The boot repair stuff might seem easy but I should never have to resort to such things just to dual boot.

    And what happens if things get screwed up and I can't get to the site to get the program or technical support??

    Remember, when I am using windows, a hacker or virus could damage the uefi partition and on the subsequent boot, neither would load.
    Last edited by zacharysonicfast; October 14th, 2012 at 02:13 AM. Reason: An observation

  6. #16
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    Oct 2012
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    19

    Re: Linux & Win & UEFI dual booting problem

    Quote Originally Posted by oldfred View Post
    I am afraid dual booting is a bit more advanced. And UEFI is new so there may be cases where you have to use commands to do things.

    But we usually post terminal commands as Linux has many gui's and each is different on how to do things, where the terminal command is the same. Most cases you should just have to copy & paste which does not require really learning the commands any more than clicking on menus.

    I still do not understand what you did that Windows had to reinstall. Just plugging drive back in should not have caused that.

    My suggestions have always been to have Windows on one drive and fully bootable without any other drive. But you can chainload from grub's menu to boot Windows. That also works with UEFI. And on my system a flash drive is seen as another hard drive to boot, so there is no real difference.

    UEFI dual boot two drives
    http://ubuntuforums.org/showthread.php?t=2031836
    Uh-Oh, i just realized something. What if my laptop has uefi active, I put in a totally new hard drive ten install linux to that drive. Will linux know to make extra partitions?
    When manually partitioning a drive will linux be smart enough to force me to make the extra uefi partition?

    And what size does it need to be? 200mb? 300mb?
    50mb? And more importantly why any particular size?? Why the first partition? Why not the last partition?
    The uefi partition would only be used once per boot. Why put it on the fastest part of a normal hard drive what the speed would be precious to the user?

    Maybe when we are all forced to go to cloud computing I won't have to worry about it.

  7. #17
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    Re: Linux & Win & UEFI dual booting problem

    You have to have a boot loader.

    The UEFI specification says it should be first, but some have made it second or third. I think the FAT32 driver in UEFI cannot read over a certain size so it is easier just to specify it should be first than try to explain exactly what the limits are.

    If a separate drive and you boot the install in UEFI it will just install without any issue.

    Grub does not create a correct chain load entry with UEFI, but you can use Boot-Repair to add a correct entry.
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  8. #18
    Join Date
    Oct 2006
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    158

    Re: Linux & Win & UEFI dual booting problem

    Add the following to /etc/grub.d/40_custom

    menuentry "Windows 7 " --class windows --class os {
    insmod part_gpt
    insmod part_msdos
    set root='(hd0,gptX)' <-- Your gpt partition number, ie. gpt2
    search --no-floppy --fs-uuid --set=root XXXX-XXXX ---> Your uuid for ms-dos partition, ie. 763A-3456
    chainloader /EFI/Microsoft/Boot/bootmgfw.efi <-- copy bootmgfw.efi from your Windows installation.

    For some help. https://gitorious.org/tianocore_uefi..._UEFI_boot_USB


    Thanks walt

  9. #19
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    Oct 2012
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    Re: Linux & Win & UEFI dual booting problem

    I have contacted ASUS about the issue to see if I can turn off UEFI and use BIOS only since I only have a 500gb hard drive and UEFI isn't needed. Still waiting for a reply.

    If I can then I shouldn't have any more problems.

    I don't want a boot loader controlling anything. Had a few bad experiences with those, especially GRUB.

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