Happens for me as well on a fresh install of Ubuntu 16.04.1 LTS XFCE on a Lenovo Thinkpad L450. The workaround Ctrl-Alt-F1 then Ctrl-Alt-F7 fixes it.
Happens for me as well on a fresh install of Ubuntu 16.04.1 LTS XFCE on a Lenovo Thinkpad L450. The workaround Ctrl-Alt-F1 then Ctrl-Alt-F7 fixes it.