Now that I think about it I experienced a similar bug some time ago. In my case
the problem was that after changing the filesystem the partition type was not
updated accordingly. So what may be happening to you is that after you changed
the partition from LVM to ext3 it was formatted correctly with ext3, but in the
partition table it was still marked as LVM, causing grub to fail to mount. You
could verify this by firing up fdisk during the installation and checking (with
"p") that the partition type is still LVM.
In that case this would be a dupe of bug 128668, even though the description
there is a little mixed up.
This is a long standing bug that should be fixed!
** Changed in: ubiquity (Ubuntu)
Status: Incomplete => Confirmed
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Grub Fatal Error on Install
https://bugs.launchpad.net/bugs/260615
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