Results 1 to 9 of 9

Thread: Mac Mini 6,3 12.04, working fine, then update borks system

  1. #1
    Join Date
    Jan 2007
    Beans
    Hidden!
    Distro
    Ubuntu 13.04 Raring Ringtail

    Mac Mini 6,3 12.04, working fine, then update borks system

    I'm running 12.04 on a mac mini server, and all was well until an update in the pat few days. Ran a regular kernel update (whatever came out this week 6/3) and restarted the computer. Now Ubuntu won't boot, can't even get to grub. I just get a blinking cursor.

    Any tips on how to diagnose and fix?

    The hardware is fine, it works in OS X.

  2. #2
    Join Date
    May 2006
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    had the same problem with a mac mini
    it seems that on install of a linux system it loads the EFI boot loader
    but on a kernel update it fubars the system

    maybe reinstall and then install the grub efi bootloader, that may work
    (never tried it) in the ubuntu software centre search for grub efi

    but in the end i built a new small factor shuttle system to run linux ...
    Last edited by MrSteve; June 8th, 2013 at 12:46 AM.

  3. #3
    Join Date
    Nov 2008
    Location
    BSAA Headquarters
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    moved to apple users

  4. #4
    Join Date
    Jan 2007
    Beans
    Hidden!
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    I did manage to get the system back online, but only via installing 13.04. This right in line with MrSteve's observation. 13.04 had the latest Grub EFI bootloader. If you do install 13.04.0 please note that the default install kernel doesn't have support the wireless or network card until an update is run. So have a backup usb network connection handy after install. After an update everything works off the bat except for video which requires some tweaking to get full color:
    # intel_reg_write 0x70008 0xC4002000
    # intel_reg_write 0x70180 0xDA004400

  5. #5
    Join Date
    Aug 2012
    Beans
    3

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    Guess I could have perused the latest posts... This sounds like the exact same problem I just ran into in post: http://ubuntuforums.org/showthread.php?t=2153625

    My question for you is, did you fresh install everything? Or can a simple reformat of a /boot partition do the trick?

  6. #6
    Join Date
    Jan 2007
    Beans
    Hidden!
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    I was going to update to 13.04 anyway so I just went ahead and fresh installed everything. Well almost, kept my home and am going to restore my /etc selectively.

    I suspect, if I had been really diligent I could have even used a grub repair to fix the issue.

  7. #7
    Join Date
    Aug 2012
    Beans
    3

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    Well... I tried a grub repair using boot-repair and that didn't seem to work either - but I'm also not a grub expert.

    Here's the pastebin of the boot-repair http://paste.ubuntu.com/5756512/

    After hours of struggling with that, I stumbled on http://rodsbooks.com/ubuntu-efi/ and started heading down this path. Now I boot into refind, it finds both 3.0.2-35 and 3.0.2-45 kernels, neither of which will boot. Tried Super Grub Disk 2 - also no luck... it finds the core.img and when I select it, it just reboots the system.

    Any thoughts would be appreciated. If not, it looks like I'll be imaging the drive and just reinstalling everything. Are you booting 13.04 using rEFIt with hybridMBR or are you booting into 13.04 in EFI mode?

  8. #8
    Join Date
    Jan 2007
    Beans
    Hidden!
    Distro
    Ubuntu 13.04 Raring Ringtail

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    This maybe too simple, but have you tried booting back into mac and editing which partition is booted from in rEFIt/rEFInd?
    For me after a reinstall, I realized that I kept telling refit to boot my same linux icon, only to ignore a new icon (like a set of blocks) that was the 64 bit EFI boot (I beleive) for 13.04 and therefore working.

  9. #9
    Join Date
    Apr 2007
    Beans
    5

    Re: Mac Mini 6,3 12.04, working fine, then update borks system

    You don't have grub (grub is MBR only ...) Grub-EFI is for EFI and your hard disk is GPT so it's EFI

    so Booting with grub-repair and such.. doesn't work

    EFI Stub booting is not supported by kernel 3.2 it's not going to work


    you need to boot Linux in legacy mode
    burn the grubsuperbootdisc to a dvd not usb
    then hold ALT when booting and do NOT select efi but "Windows Disk" this makes the Apple boot into legacy mode and do bios emulation which boots kernel 3.0 or 3.2
    the upgrade the kernel to 3.10 or 3.8 whatever

    ..then it works

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •