no backspace, delete or arrow keys in ghci

Hello to everybody, I'm currently working with Haskell via the ghc interpreter (version 6.10.4 on Ubuntu 9.10). The problem, if it is really a problem and not a normal comportement, happens when I try, as example, to enter some characters after having execute getLine. Actually, if I make a mistake when typing the string, I can't use neither backspace, delete or even arrow keys to correct it before hitting enter to finish input. In fact, as example, if I hit backspace, I get "^?" in place of deleting the previous character ... :^( As I wrote above, I don't know if it is a "bug" or not. Maybe it is normal. Can someone help me ? Thanks in advance, Gabriel