Are you using Gnome (Ubuntu) or something else (e.g. Kubuntu)?
/etc/acpi/webbtn.sh (which gets executed) simulates a keypress with key code 150 ($KEY_WWW).
As far as I understand this should be caught then by Gnome to open your browser.
Anyway, "sudo acpi_fakekey 150" does nothing for me, too (KDE4 and Gnome).
Are you using Gnome (Ubuntu) or something else (e.g. Kubuntu)?
/etc/acpi/webbtn.sh (which gets executed) simulates a keypress with key code 150 ($KEY_WWW).
As far as I understand this should be caught then by Gnome to open your browser.
Anyway, "sudo acpi_fakekey 150" does nothing for me, too (KDE4 and Gnome).