I've also had problems with .Xmodmap not "working". But my problem seems to be that it does work, but then the modmap subsequently gets reset to the default. This seems very much like bug #97175 (https://bugs.launchpad.net/ubuntu/+source/xfce4-session/+bug/97175/).
I've also had problems with .Xmodmap not "working". But my problem seems to be that it does work, but then the modmap subsequently gets reset to the default. This seems very much like bug #97175 (https:/ /bugs.launchpad .net/ubuntu/ +source/ xfce4-session/ +bug/97175/).