2 Solutions to Fix Dual Boot Issue with Yosemite and Ubuntu

If you are running both Ubuntu and Mac OS on your Mac laptop and have upgraded from Mac OS X to Yosemite,

You may see an error message stating that the bootloader has been rewritten and you can no longer dual boot with Yosemite and Ubuntu.

This article will guide you on how to fix it if you encounter this problem.

How to solve dual boot issue with Yosemite and Ubuntu?

If you are facing this problem, here is how to fix it:

1. Using the REFInd Boot Manager
2. Boot from another device

Let’s take a closer look at both solutions:

Solution 1: Using rEFInd Boot Manager

Download rEFInd from the Sourceforge website for OSX Yosemite. Extract the compressed file. You should see a folder named “refind-bin-0.8.3”.

• Find the install.sh file in the folder.
• Next, launch the Terminal. Type sudo, then drag the “install.sh”file into the terminal and add -esp to the end of the script.
• This is what it should look like: sudo /path/to/refind/folder/install.sh –esp

• After executing the above command, press Enter and you will be prompted for a password.
• If the installation was successful, you will notice the newly mounted EFI disk. Navigate to the EFI-attached drive in Finder and press Enter.
• There are three folders: “Apple”, “refind”and “tools”.
• Now rename the “refind”subdirectory to “boot”.
• Rename the “refind_x64.efi”file to “bootx64.efi”in the download folder.

• Go back to the “refind-bin-0.8.3″folder and find the “drivers_x64″folder.
• Copy this folder and place it in the “boot”folder of the EFI drive.
• Rename the “drivers_x64″folder to “drivers”.

That’s all; all is ready. Now restart/reboot your Mac and you should be able to select Ubuntu and boot into it without any problems.

Solution 2 – Boot from another device

Another solution is to boot from another device or enter online recovery mode before changing the CoreStorage drive via the command line.

Preparation:

• Make a backup copy of your data.
• Remove all external drives (especially the external Time Machine backup drive).
• At startup, press alt+cmd+R to enter online recovery mode.
• A current firmware update must be installed, as well as an Ethernet or WLAN (WPA/WPA2) connection and a router with DHCP enabled.
• With a 50 Mbps connection, it takes approximately 4 minutes to download the network boot recovery image, which is often downloaded from the Apple/Akamai server.
• Ethernet is preferred because it is more reliable. If you are limited by WIFI and the download process is not working, just restart your Mac until the download process completes successfully.
• You can also start with a bootable installation flash drive (Mavericks or Yosemite) or a flash drive containing the entire system (Mavericks or Yosemite).

Change CoreStorage:

• Utilities/Terminal should be open in the menu bar.
• Enter the diskutil cs list command.
• Run diskutil cs resize.
• Add LVUUID size with LVUUID: UUID and logical volume size: final size of your Macintosh HD
• For example: diskutil cs resizeStack DC2473AF-0833-4DBD-BF8F-D5D60063554A 200g
• Type “exit”to close the Terminal.
• Restart the main volume.
• Start installing Ubuntu on the freed up storage space.

Conclusion

This completes the Yosemite and Ubuntu dual boot issue. I have collected all the facts to help you solve this problem. Apply each of the above strategies one at a time with caution.

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