Auto detect keyboard during install fails for Spanish keyboards

Steps to reproduce this error:
1. Install Ubuntu 10.04 Lucid Lynx on any computer with a Spanish keyboard.
2. When the keyboard detection screen appears try to type the accented 'a' character (á). This is, first press the accent key and then press the a letter in the keyboard for testing the keyboard.

Desired output:
The box should display an accented 'a' character (á).

Current output.
The box displays an apostroph an an'a' character ('a).

Workaround:
If you choose to select manually the keyboard settings, you just have to select any keyboard layout and then choose again the auto detect keyboard layout. Then, the keyboard would work correctly.

Please note that the keyboard layout selected by default is actually correct. However, it does not seem to work correctly in the text box for testing it.

Description: Ubuntu 10.
Release: 10.04