I can confirm the same behaviour on my machine (AMD 64 feisty herd 5). No problem if I use the i386 CD. BTW, perhaps it helps, in answer to key presses the relevant control codes are shown (for instance Enter=^M etc.).
-- No response to keyboard input at prompt after ejecting CD-ROM https://launchpad.net/bugs/58503 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs