I too have the same problem, i am using Dell Inspiron 5160 Laptop (855 chipset) Dapper was working fine, using the vesa driver. Is this black screen related to 855/915resolution ? Both never worked with my laptop, failing with "unable to determine bios type" error.
-- Install 6:10 Failure: Black screen at Live Desktop Stage https://launchpad.net/bugs/67487 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs