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I downloaded ubuntu-12.04-amd64.iso and created a bootable USB. I tried installing it (by running wubi.exe in Windows).

But the installer started downloading ubuntu-12.04.2-wubi-amd64.tar.xz (524 MB). My internet connection is too slow to download this file in one stretch. Is there any way to do this in offline mode?

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Is there any reason you want to use wubi? Dual booting from grub is usually faster and more stable. – Another Googler Mar 14 '13 at 3:02

Simply put both wubi and ubuntu iso(which you downloaded) in same folder(try to put wubi and ubuntu iso only no other files in that folder) and run wubi it will work.

You don't need to download wubi from website, just open ubuntu iso file in winrar and you can find wubi as last file, extract only wubi outside.

You should disconnect your internet connection before running wubi.

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Where did you get ubuntu-12.04-amd64.iso because the latest is ubuntu-12.04.2-desktop-amd64.iso. Wubi will reject an iso if it doesn't match the latest releases, or the online md5sum check fails.

If you run the wubi.exe you don't need a bootable USB. Just the iso and wubi.exe.

This is what to do if you want to install Wubi offline:

  1. Download the latest iso for the release you want
  2. Download the latest matching wubi.exe for the same release
  3. Save both in the same directory before running wubi.exe.

If Wubi downloads the diskimage ubuntu-12.04.2-wubi-amd64.tar.xz then it's likely that it's not finding the iso (not in same folder) or it's corrupt.

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One best thing that can be done is download the wubi installer of the same version as the iso,

If it is windows 7, you need tools like daemon tools, which could mount the iso image. In Windows 8, this feature is already present.

Now run the downloaded wubi.exe installer, and no need of usb or cd.

Hope this works fine, if it doesn't, let us know.

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