Restarting lightdm seems to fix it, if this is the same problem described here:
http://askubuntu.com/questions/498968/ctrl-alt-t-stopped-working-ubuntu-14-04
Restarting lightdm seems to fix it, if this is the same problem described here:
http:// askubuntu. com/questions/ 498968/ ctrl-alt- t-stopped- working- ubuntu- 14-04