Install rEFIt: Once you download it, extract it on Mac and Double click on “install.sh” setup file. When you got message “Installation has completed successfully”. Check the configuration by completely shutdown Mac and Reboot by Press and hold option key (not restart). REFIt boot manager will appear on screen. –USB Thumbdrive –Macbook Air (11″ or 13″) Guide: ALWAYS DO A Time Machine BACKUP BEFORE TRYING ANYTHING WITH BOOT CAMP! REFIt Installation. First thing you will want to do is to download and install the rEFIt utility on your Macbook Air in OS X Snow Leopard. Download the DMG and open it and then run the rEFIt.mpkg to install it. Mar 12, 2009  rEFIt isnt even seeing my 8Gb USB Stick Formatted to MS-DOS with the W7 ISO on, the USB is working as the light is pulsing, but rEFIt see's nothing. Trying 10.6 now, to see if the.iso couldnt be seen, and the.dmg can, either way i want them both installed.

1. Install Refit From Usb Port
2. Install Refit On Usb Drive
3. Install Refit From Usb

Install Windows 7 with the bootable USB on a Mac Mini running OS X Lion. On the Mac Mini, download rEFIt. Install rEFIt. Open Boot Camp Assistant. Plug in the USB with the Windows 7 installation. Click “Continue” and such until you get to the screen where you can choose to download Windows Support software and install Bootcamp with. Booting linux from usb using EFI. I need to use a USB drive as an installation media for my Mint and Ubuntu. For that I have unetbootin to make the usb bootable. But my PC only supports EFI. REFIt etc., they are booting from usb, but I don't know how to configure it to boot the Linux distribution in my usb drive. Ubuntu boot linux-mint. I tried to install it with an USB flashdrive, but the system don't recognize it as a bootable device. I have the windows 7 ISO, vmware fusion, refit (i searched on the interet for the solution but i couldn't find. Allows one to boot to usb drives to install windows 7 on macbook air w/o an external dvd drive:) More at tech-recipes.com.

If you select 'USB' and 'Mac' on this download page, it gives a series of command line instructions to make a USB key which the MacBook will boot into Ubuntu from.

I've followed them to the letter two or three times on different USB keys, and it doesn't work. There's a very great deal of technical discussion about EFI etc. but this set of instructions seems to suggest it should just work, but it doesn't.

Help? I'm increasingly unhappy with the more locked-down approach Apple is taking, and I'd quite like to start using Linux with a view to transitioning over to using it as my main operating system, but booting from the CD takes forever, runs slowly and I'm really hoping to get it moving off USB.

Can anybody help me?

Braiam

7 Answers

Short answer: You can't. Apple doesn't want you to boot an OS other than OS X off USB. If your Mac has a working optical drive, use it. It will save you pain. If you have a newer Mac (64 bit), just remember to use the Mac iso(amd64+mac), not the regular amd64 iso. (See this for an explanation of the difference)

Longer answer: (Ok, I lied above.) You can, but 'it's complicated'. One method that has worked for a number of people is to dd the bootable USB key to its own partition on your hard drive and then boot off that partition. The basic method is explained nicely here.

This doesn't always work, even on the same hardware. In particular, if you have a MacBook Air, which doesn't have an optical drive, then the forums are filled with posts of trying the dd-to-a-partition trick and failing. For MacBook Air owners, it is strongly advised to obtain a MacBook Air SuperDrive (no, a regular USB CD/DVD drive does not suffice) and then use that to install through the usual CD route (using the Mac iso for a 64 bit install).

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Lastly, this USB method actually worked(!) to install 11.10 onto my MacBook Air 3,1 (late 2010 model). However, I expect some modification is needed to work on other versions of the Air, not to mention other Macs.

Chan-Ho SuhChan-Ho Suh

Install Refit From Usb Port

How to create a bootable USB stick on OS X/macOS

This procedure requires that you create an .img file from the .iso file you download. It will also change the filesystem that is on the USB stick to make it bootable, so backup all data before continuing.

1. Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight).

2. Insert your USB flash media, which must be 2GB or larger and has only 1 partition on the USB flash drive. For Ubuntu 18.04 and later the USB flash drive should be 4GB or larger.

3. Launch the Disk Utility app which is located in Applications ->Utilities or Spotlight search.

   • In the lefthand pane, click on the USB drive to select it.

   • Click the Partition tab.

   • Select 1 Partition from the dropdown menu.

   • Enter a name for the drive.

   • Change the Format to Mac OS Extended (Journaled).

   • Click the Options button.

   • Ensure that the GUID Partition Table radio button is selected and click OK.

   • Click Apply.

   Warning: Disk Utility needs to be used with caution as selecting the wrong device or partition can result in data loss.

4. Convert the .iso file to .img using the convert option of hdiutil e.g.,

   Note: OS X tends to put the .dmg ending on the output file automatically.

5. Run:

   to get the current list of devices.

6. Run:

   again and determine the device node assigned to your flash media (e.g. /dev/disk2).

7. Run:

   (replace N with the disk number from the last command; in the previous example, N would be 2).

8. Execute:

   (replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.img or ./ubuntu.dmg).

   • Using /dev/rdisk instead of /dev/disk may be faster
   • Give the dd command enough time to finish. It could take 3-5 minutes to finish executing. When dd is finished, you should see a confirmation that the process has completed.
   • If you see the error dd: Invalid number '1m', you are using GNU dd. Use the same command but replace bs=1m with bs=1M
   • If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Start the 'Disk Utility.app' and unmount (don't eject) the drive.

9. Run:

   and remove your flash media when the command completes.

Booting Ubuntu on a Mac from the USB drive

The newly created Ubuntu live USB drive is now ready to be inserted into a Mac.

^{Booting Ubuntu from the USB drive}

To test the Ubuntu live USB on a Mac:

1. Insert the USB drive into an available USB port.
2. Reboot or turn on the Mac.
3. Immediately after the startup chime, press the Option key (sometimes marked Alt).
4. Select the USB drive from which to boot by using the left and right arrow and Enter keys.
5. If you can't see the USB drive in step 4, download rEFInd boot manager to get a screen where you can choose from the available devices to boot from.

karelkarel

With this four steps I installed Ubuntu 13.04 on my Macbook Air mid 2011:

1. Create a new partition using Disk Utility

2. Install latest version of rEFInd on your Mac

3. Download the Mac ISO of Ubuntu and create a bootable USB stick with UNetbootin

4. Restart your Mac select boot from USB and install Ubuntu

After a LOT of trouble with various methods i finally got ubuntu 13.04 32bits working on a macbook 2,1 (mid 2007). My DVD drive is broken so i really needed a live USB.

(DISCLAIMER:)I´m no programmer but after setting things up the following way it worked like charm.

1. Install the latest version of rEFIt.
2. Download Mac Linux USB Loader from this page: https://github.com/SevenBits/Mac-Linux-USB-Loader/releases/tag/v1.1
3. Download the source code from the same link. You will need the bootlA32.efi file located in the 'EFI' folder.
4. Insert your USB flash drive, and format it to FAT 32 using disk utility.
5. Open Mac Linux USB Loader and select the .iso file you want to boot.

6. Click on Create Live USB and follow the instructions, it's a pretty straight forward process.

7. My macbook model just refused to boot on efi64, so i had to do some tweaking here:

8. Go ahead and open the USB drive. Go to the 'efi' folder and then the 'boot' folder. Inside you should see a file named bootX64.efi

9. Erase it and place the bootlA32.efi file instead.

10. Now just reboot and from the rEFIt menu choose to boot from the USB drive.

I Hope it helps somebody out there!

This is a FAQ in the Ubuntu Forum: http://ubuntuforums.org/showthread.php?t=1046568

It does not work directly, but requires some special handling with GRUB http://ubuntuforums.org/showthread.php?t=995704

Added: The information on the Download page shows how to build a USB key that is bootable on PCs, but not on Macs.

Download Ubuntu and then make one bootable USB learn more which works with Macbook, iMac and Mini etc. (2011 and later versions).

Requirements:1. 2GB USB drive2. Ubuntu System with net access.

Try to get a machine with Ubuntu already installed, a PC, notebook, whatever, maybe from a friend, and then get an ISO image of Ubuntu 12.10 amd64. Using Ubuntu, open the 'Startup Disk Creator' utility, select the ISO image of Ubuntu, the USB device and create the disk.

Install Refit On Usb Drive

Hold the option key while the Mac is booting and select the USB drive to boot from and you're done. I've done it, and it works.

Peter Mortensen

Install Refit From Usb

protected by Community♦Apr 24 '14 at 19:12

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