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I want to convert by Wubi Ubuntu install to a partition. But what filesystem is it? Which should I use?

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This is not a trivial task. Much better to create a backup of your current installation, and restore it to a freshly created installation as you want it. –  Thorbjørn Ravn Andersen Nov 18 '11 at 8:42
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up vote 2 down vote accepted

Wubi itself isn't a filesystem. It is simply files put onto a Windows partition. If your wanting to convert it to a real partition, I'd suggest using ext4, as it is the default filesystem Ubuntu uses in a real install.

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It doesn't "simply put files"; it actually creates a real filesystem (ext<i>something</i>) in a loop-mounted file. –  grawity May 28 '11 at 18:31
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Its an image, booted from grub (which can boot raw disk images) chainloaded from NTLDR or bcd using whatever's ubuntu's preferred file system - this would mean ext3 or 4. However this probably would not be a major factor in conversion from image to drive.

On the other hand, the method that used to be 'preferred' for such moves. lvpm is depreciated, you'd likely need to use some flavor of online backup, remastering or DD, and all 3 possibilities should work regardless of your filesystem.

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