I've run into this issue as well when installing Precise on my brother's and cousin's machines, with both the manual partitioner and when simply picking the automatic "side-by-side" option from the installer. The workaround was to always use the manual partitioner to switch the default device for bootloader installation to /dev/sda, after which the installation proceeds successfully.
I've run into this issue as well when installing Precise on my brother's and cousin's machines, with both the manual partitioner and when simply picking the automatic "side-by-side" option from the installer. The workaround was to always use the manual partitioner to switch the default device for bootloader installation to /dev/sda, after which the installation proceeds successfully.