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Thread: Mac wont let me dualboot?

  1. #1
    Join Date
    Aug 2008
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    Angry Mac wont let me dualboot?

    The following is a very long post, and i apologize in advance, but i am new to this operating system, and do not know what i did wrong, so it would help the most, i reasoned, if i told you folks everything

    I just installed Ubuntu on my macbook, I successfully went through the ubuntu installer with a friend's help. He had me partition the 10 gigs of space i had left for Ubuntu into two parts. 9 gigs for ubuntu itself, and one gig for the swap (or whatever it's actually called). But, as I realized later, I may not have set a mount point for the mac partition of my hard drive. This may even be the cause of my biggest problem, which follows.

    I futzed around in ubuntu, couldn't get wireless ( an issue, but not my biggest), then restarted my macbook to tell him that i had got it working, and even though i held down the alt/option key, i was automatically booted into linux, so i restarted again, this time managed to get into OS X, then restarted again, to try and get wireless in ubuntu ( i held down the alt key, of course, ) but when i got to the menu that used to offer where to start the computer from (and hence, which OS to load), i was unpleasantly surprised. the only choice my computer gave me was the mac portion of my hard drive.

    I restarted my macbook several more times, all the while holding my alt key, but with no improvement

    I finally gave up my tactic and logged into OS X to look at my hard drive. Disk Utilities told me that there were the three portions i had expected (mac, ubuntu, and swap) but that there was another partition, a third of a gig, and that there was an amount of free space that was, coincident or not, equal to the amount that was taken up by the Ubuntu portion of my hard drive.

    I called my friend, he said it had to do with the mac boot code, and that i would probably have to rewrite parts of it, he also said that i should ask the mac-ubuntu forums for help.

    I would appreciate any help, thanks in advance.

  2. #2
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    Jul 2008
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    Re: Mac wont let me dualboot?

    Make it one big partition. Reinstall Ubuntu, and set the mount point to the Ubuntu partition. No swap this time. Install Grub to the Ubuntu Partition, and make sure you get rEFIt. Works every time.

  3. #3
    Join Date
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    Kubuntu 12.04 Precise Pangolin

    Re: Mac wont let me dualboot?

    I think this used to happen to me, reset the pram let it chime at least 3 times... i think it's ctrl+alt+p+r at boot
    ~
    Desktop:ASRock P4i65GV/P4 2.8ghz 2gbram
    Laptop:Toshiba L350-PSLD8C Centrino64 dualcore 2ghz 4gbram

  4. #4
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    Re: Mac wont let me dualboot?

    kdb424: make the ubuntu, the swap, and the lil partition into one or those 3 and my mac?

    trash: what does all that mean? sorry, im totally new here
    Last edited by leo2791; August 4th, 2008 at 05:08 AM. Reason: forgot stuff

  5. #5
    Join Date
    Nov 2004
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    Quebec
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    Distro
    Kubuntu 12.04 Precise Pangolin

    Re: Mac wont let me dualboot?

    Hold all 4 of theose keys down at boot and hold til it chimes at least 3 time... you're basically clearing out the ram of possibly bad data, but now that i think about it i think i did this for another issue... anyway reseting the pram is in no way a bad thing to do.
    while in Ubuntu try

    sudo ybin

    which will rewrite the boot file... i think.
    ~
    Desktop:ASRock P4i65GV/P4 2.8ghz 2gbram
    Laptop:Toshiba L350-PSLD8C Centrino64 dualcore 2ghz 4gbram

  6. #6
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    Re: Mac wont let me dualboot?

    Quote Originally Posted by leo2791 View Post
    kdb424: make the ubuntu, the swap, and the lil partition into one or those 3 and my mac?
    What? Ubuntu works fine on Mac's with no swap partition in most cases is what I was saying.

  7. #7
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    Re: Mac wont let me dualboot?

    Quote Originally Posted by kdb424 View Post
    What? Ubuntu works fine on Mac's with no swap partition in most cases is what I was saying.
    I wouldn't just tell people to remove their swap, especially since it is not going to fix his problem. Swap is useful for some things. Just because it can work without swap doesn't mean you should.

    To the OP:
    Boot into OSX and install rEFIt.
    http://refit.sourceforge.net/

    Reboot and you should get a nice boot screen. on the bottom row there is an icon for the partition tool. Select it and it will likely say it needs to sync the partition tables. Do it.

    After that, see if you can boot into both OS X and Ubuntu, and if not, post back, as you will likely need to, reinstall GRUB.

  8. #8
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    Re: Mac wont let me dualboot?

    installed rEFIt, ran partition inspector, it says this:

    *** Report for internal hard disk ***

    Current GPT partition table:
    No GPT partition table present!

    Current MBR partition table:
    # A Start LBA End LBA Type
    1 63 213732334 af Mac OS X HFS+
    2 213732351 214404225 83 Linux
    3 232476615 234436544 82 Linux swap / Solaris
    4 214419555 232476614 83 Linux

    MBR contents:
    Boot Code: Unknown, but bootable

    Partition at LBA 63:
    Boot Code: None
    File System: HFS Extended (HFS+)
    Listed in MBR as partition 1, type af Mac OS X HFS+

    Partition at LBA 213732351:
    Boot Code: None
    File System: ext2
    Listed in MBR as partition 2, type 83 Linux

    Partition at LBA 232476615:
    Boot Code: None
    File System: Unknown
    Listed in MBR as partition 3, type 82 Linux swap / Solaris

    Partition at LBA 214419555:
    Boot Code: None
    File System: ext3
    Listed in MBR as partition 4, type 83 Linux



    restarted my comp (not holding any buttons), got standard mac login page
    Last edited by leo2791; August 5th, 2008 at 01:04 AM. Reason: wanted to make table more clear

  9. #9
    Join Date
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    Re: Mac wont let me dualboot?

    Quote Originally Posted by leo2791 View Post
    Current GPT partition table:
    No GPT partition table present!
    Well that is bad. can you boot from the Ubuntu LiveCD and run the command:
    Code:
    sudo parted /dev/sda print
    and
    Code:
    sudo fdisk -l /dev/sda
    Quote Originally Posted by leo2791 View Post
    restarted my comp (not holding any buttons), got standard mac login page
    please see the refit install instructions. you need to run the install script so that the menu will work on reboot. http://refit.sourceforge.net/doc/c1s1_install.html

  10. #10
    Join Date
    Aug 2008
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    Re: Mac wont let me dualboot?

    Disk /dev/sda: 120GB
    Sector size (logical/physical): 512B/512B
    Partition Table: msdos

    Number Start End Size Type File system Flags
    1 32.3kB 109GB 109GB primary hfs+
    2 109GB 110GB 344MB primary ext2
    4 110GB 119GB 9245MB primary ext3
    3 119GB 120GB 1003MB primary linux-swap



    Information: Don't forget to update /etc/fstab, if necessary.


    Disk /dev/sda: 120.0 GB, 120034123776 bytes
    255 heads, 63 sectors/track, 14593 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Disk identifier: 0x0009cada

    Device Boot Start End Blocks Id System
    /dev/sda1 1 13305 106866136 af Unknown
    /dev/sda2 13305 13347 335937+ 83 Linux
    /dev/sda3 14472 14593 979965 82 Linux swap / Solaris
    /dev/sda4 13348 14471 9028530 83 Linux

    Partition table entries are not in disk order

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