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I have 32bit 11.10 installed on an LVM disk taking up all 500 GB, and I would like to install 64bit 12.04 on top, preserving the data in my home directory.

I used to do that pre-LVM by just not formatting the partition mounted as /home, installing over / and /usr and formatting /tmp, But now it don't recognize the partition table.

I've never had much luck with upgrade and so I just install afresh when I want a new version.

Surely I can do what I want, can't I?

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You need to make a new install with formatting all partitions except home partition.

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Can you provide more detail? Right now, this doesn't seem to say anything different from what the OP tried said he tried to do, in the question. –  Eliah Kagan Sep 8 '12 at 8:14
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