Bug#879642: fixed in simple-cdd 0.6.6
The bug does not seem to be fixed. I am still getting this error: 2019-02-11 15:45:44 ERROR verify gpg signature exited with code 2 2019-02-11 15:45:44 ERROR Last 5 lines of standard error: 2019-02-11 15:45:44 ERROR verify gpg signature: gpg:avec la clef RSA 067E3C456BAE240ACEE88F
Bug#922020: gnome-shell: Keyboard layout not applied in programs using Xwayland
Thanks, downgrading to (stable) xkb-data 2.19-1+deb9u1 fixed the issue.