With Whonix 15.0.0.4.9 once upgrading, package keyboard-configuration asks what keyboard layout to use. Useless question for users already using the keyboard. More useless for GUI users. Usability issue. Upgrade non-interactivity issue.
Possibly (this) upstream bug but not worth reporting due to project inactivity.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=840351
A potential workaround might be to preseed these debconf questions.
sudo apt-get install debconf-utils
sudo debconf-set-selections < keyboard-configuration.conf
keyboard-configuration.conf:
keyboard-configuration keyboard-configuration/altgr select The default for the keyboard layout
keyboard-configuration keyboard-configuration/compose select No compose key
keyboard-configuration keyboard-configuration/ctrl_alt_bksp boolean false
keyboard-configuration keyboard-configuration/unsupported_config_options boolean true
keyboard-configuration keyboard-configuration/model select Generic 105-key PC (intl.)
keyboard-configuration keyboard-configuration/switch select No temporary switch
keyboard-configuration keyboard-configuration/unsupported_options boolean true
keyboard-configuration keyboard-configuration/layoutcode string us
keyboard-configuration keyboard-configuration/toggle select No toggling
keyboard-configuration keyboard-configuration/variant select English (US)
keyboard-configuration keyboard-configuration/store_defaults_in_debconf_db boolean false
keyboard-configuration keyboard-configuration/optionscode string
keyboard-configuration keyboard-configuration/xkb-keymap select us
keyboard-configuration keyboard-configuration/unsupported_layout boolean true
keyboard-configuration keyboard-configuration/layout select
keyboard-configuration keyboard-configuration/unsupported_config_layout boolean true
keyboard-configuration keyboard-configuration/modelcode string pc105
This could be added here:
https://github.com/Whonix/whonix-legacy/blob/master/debian/whonix-legacy.preinst