I am also encountering this issue with Ubuntu Gutsy Tribe 5. System with 256MB RAM hangs at 15% during "Detecting file systems". Adding an additional 128MB stick fixes the problem. This does not occur with Kubuntu or Xubuntu. Note: System does not have integrated video and is using a Matrox G400 AGP video card.
I am also encountering this issue with Ubuntu Gutsy Tribe 5. System with 256MB RAM hangs at 15% during "Detecting file systems". Adding an additional 128MB stick fixes the problem. This does not occur with Kubuntu or Xubuntu. Note: System does not have integrated video and is using a Matrox G400 AGP video card.