Gnome boxes: Slash (/) and Question Mark (?) key doesn't work in Debian 10 guest vm in a 18.04 Ubuntu Host with a Brazilian Keyboard

[Marcelo Akira Inuzuka]

Slash (/) and Question Mark (?) key doesn't work in Debian 10 guest vm in a 18.04 Ubuntu Host with a Brazilian Keyboard

Reprodution:

Create a Debian 10 guest VM, open it with Gnome Boxes. Type Slash (/) key in a text editor and nothing appear.

Tests diagnostics:

In Ubunt host, run xev, then type Slash (/) key. This is the event log:

KeyRelease event, serial 37, synthetic NO, window 0x4a00001,
    root 0x2ac, subw 0x0, time 3985593, (489,279), root:(689,543),
    state 0x0, keycode 97 (keysym 0x2f, slash), same_screen YES,
    XLookupString gives 1 bytes: (2f) "/"
    XFilterEvent returns: False

Run xev in Debian Guest, then type Slash (/) key. No events are logged.

Workaround:

Remap Backslash (\) key to Slash (/) key with

xmodmap -e "keycode 94 = slash"