[martin_fierro]

Installed Lion OK on a Mac Pro.

Then tried installing it on a 2.53 GHz Intel Core i5 Macbook Pro with 467.93 GB free space -- and it kept balking, referring me here.

So, like, wtf.

[Glenn]

The disk you are installing Lion on is a RAID volume
or
The disk has a non-standard Boot Camp partition setup, where further partitioning was performed after running Boot Camp Assistant, or the configuration that Boot Camp Assistant created was manually modified

Do either of those apply?