Also affects me on Lubuntu 16.04. Installing IBus (sudo apt ibus) and using Preferences > Language Support to change the Keyboard input method system to IBus, followed by a system reboot, has fixed the issue (compose:ralt in Keyboard Layout Handler now functions as expected).
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libx11 in Ubuntu. https://bugs.launchpad.net/bugs/1573755 Title: Compose and dead keys stopped working with XIM after upgrade to 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1573755/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp