Lion won't install on primary partition

I am having problems installing Lion.  I have 2 partitions.  The larger, primary partition, and a smaller secondary partition.  Both have Snow Leopard installs (and up to date).  I can't get Lion to install on the primary partition.  The installer tells me that the primary partition can't be used to start up the computer (and I am currently running on that partition).
I ran disk utility, and still nothing.  Any thoughts?

I'm posting this for anybody else who might have a similar issue.  I installed lion on the secondary partition, booted from that install and ran disk utility again.  I again repaired the disk, this time doing the entire drive (think I had done only the partitions previously). Something was repaired in the partition table and all is fine now. I'm not certain wheth it was the new version of disk utility or the focus of my repair, but all is now well.

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