If you have set up your removable media with supermount, and try emerging one of the newest baselayout ebuilds, it will fail. The reason is that the merging process goes through /mnt among others and looks for .keep I recon. And then the supermount kicks in and tries to access the media. Reproducible: Always Steps to Reproduce: 1.Set up supermount 2.Try emerge baselayout 3.Watch it fail on the merge process right at the end Actual Results: I can simply unmount my supermount removable medias and re-emerge baselayout, and it completes successfully. Expected Results: The solution you need to implement, is a simple umount /mnt/floppy /mnt/cdrom etc (taken from fstab), right in the beginning of the merging process. This will make the merge work as expected.
*** This bug has been marked as a duplicate of 9849 ***