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Ubuntu does not recognize existing Windows partitions in a GPT disk

rated 0 times [ 2] [ 0] / answers: 1 / hits: 43568 / 1 Year ago, tue, april 18, 2023, 3:13:36

I just built a new computer and installed a clean copy of Windows 7 Home Premium (64-bit) on it. Other than verifying that the Windows install completed successfully, I have done absolutely nothing else to the computer. I now want to install Ubuntu 13.04 on the same machine in a dual-boot setup. However, the Ubuntu installer starts out by giving me the message

This computer currently has no detected operating systems.

followed by the single option

Erase disk and install Ubuntu

I expected it to say that it detected an existing Windows 7 installation and ask me if I wanted to get rid of it or keep it as a dual-boot.

I've checked out a few existing AU questions on this topic (Ubuntu 13.04 not detecting Windows 7 during Install; "This computer currently has no detected operating systems" when installing; Ubuntu 12.10 install don't recognize Windows 7; Ubuntu 12.04 installer does not see Windows already installed on my computer) and they all seem to lead to the same two conclusions:

use fixparts

use gparted

When I tried to use fixparts, the system told me it was the wrong tool, with the output

$ sudo fixparts /dev/sda



FixParts 0.8.7



Loading MBR data from /dev/sda



This disk appears to be a GPT disk. Use GNU Parted or GPT fdisk on it! Exiting!

I think gparted is a non-option for me because I want to dual-boot and — to the best of my understanding — it would wipe out the Win7 install. However, I did open it up just for inspection purposes. Here's a screenshot of everything I did:

enter image description here

For what it's worth, the hard drive itself doesn't seem to be corrupted; I can open it up in Ubuntu and see all the Windows files and directories there that I expect. (It's the middle right window in the screenshot.)

What else can I do here to get Ubuntu to install side-by-side with Windows?

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anatta

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2 Years ago

answered 1 Year ago herfor · Accepted Answer

I worked around this by taking a detour into Windows and playing with partitioning. After rebooting into Win7, I opened up the Windows Disk Management utility (diskmgmt.msc). The system was still set up to use basically the entire disk as one giant Windows partition (AKA the C: drive). I used Disk Management to chop off a 120GB segment, left it as "unallocated space" and rebooted.

(Actually, I then went back and reformatted it as NTFS, but in retrospect, I believe that that was unnecessary.)

At that point, I reopened the Ubuntu installer. The installer still didn't recognize the existing Windows install, but it did offer a "Something else" option (screenshot at debianadmin.com) of making custom adjustments to partitions. I selected that option and found the 120GB partition I created in Windows, and selected it as the partition in which to install Ubuntu.

The installer then gave me the error

No root file system defined.

Please correct this from the partitioning menu.

Some quick searching for that error message led me to an AU answer with a helpful screenshot that I won't repeat here.

After that, I got yelled at by the system for trying to use NTFS — a no-no, according to Ubuntu's Linux Filesystems Explained wiki — and for not setting any swap space — again, see Ubuntu's excellent wiki — but after I switched to Ext4 and carved a 5GB swap area out of the 120GB partition, installation proceeded without a hitch.