Hi,
I've tried to get my gnome desktop to support the euro sign and although I can display the euro sign I can't type it (Right Alt + 5). I've configured XFree86 properly and I can use the key combination AltGrey + 5 in Xfce to type the euro symbol. Also some other keys on my keyboard don't generate the correct symbol when I press them when using Gnome (tested with xev) but do when using Xfce. Maybe someone can shed some light on this. I know there is some sort of a problem when you want to use Xmodmap (don't know the details though) but I configured everything inside XF86Config-4 which is attached.
Try choosing appropriate keyboard using gnome-keyboard-properties (or keyboard capplet). Also compare the output of setxkbmap -print, when using xfce and gnome. They probably do not match. If choose the right keyboard they should match and you'll get the desired result.
Sorry, but I cannot guarantee that this will work, since I do not have similar keyboard to test.
Vaidotas
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