Comment 2 for bug 881222

To be clear the procedure outlined in https://help.ubuntu.com/11.04/ubuntu-help/keyboard-layouts.html does not work. A workaround, although temporary was to issue

sudo dpkg-reconfigure keyboard-configuration

That allowed me to select the standard US keyboard layout, with the the help of wikipedia (http://en.wikipedia.org/wiki/IBM_PC_keyboard to identify the exact physical keyboard I have). The new layout showed up in the Unity applet, to the exclusion of my previous selections, but did not do so once within the keyboard preferences pane, where only my previously selected ones showed up.

The newer US layout eventually disappeared sometime after changing the options within the keyboard preferences pane (to one of my earlier layout choices).

It seems that the keyboard preferences pane breaks after the upgrade, and if it hasn't been reported it's probably because most people are monolingual and/or use solely one layout, and haven't bothered re-configuring layouts. Thus, they haven't found the pane to be broken because they haven had the need to reconfigure.

I not sure if the following procedure would fare any better.

cat /usr/share/i18n/SUPPORTED | grep "en\|ru" > /var/lib/locales/supported.d/local
dpkg-reconfigure locales
update-locale LANG=en_US.UTF-8

http://ubuntuguide.org/wiki/Ubuntu:Edgy/TipsAndTricks#How_to_set_the_Compose_key_to_type_special_characters