Comment 3 for bug 1721401

The problems appears to be arts of gnome left over from ahanging to TWM. The following eliminated the problem.

[code]
   sudo apt remove --purge gnome-calendar
    sudo apt remove --purge libgnome-todo
    sudo apt remove --purge gnome-mahjongg gnome-mines gnome-sudoku
    sudo apt purge gnome-weather
    sudo apt remove --purge gnome-accessibility-themes gnome-themes-extra:amd64 gnome-themes-extra-data
    sudo apt remove --purge language-pack-gnome-en language-pack-gnome-en-base language-selector-gnome
    sudo apt remove --purge gnome-session-bin gnome-session-canberra gnome-session-common
    sudo apt remove --purge thunderbird-gnome-support pinentry-gnome3 network-manager-pptp-gnome network-manager-gnome
    sudo apt remove --purge libreoffice-gnome libsoup-gnome2.4-1:amd64 nautilus-extension-gnome-terminal policykit-1-gnome
    sudo apt remove --purge libgnome-autoar-0-0:amd64 libgnome-games-support-common libgnome-menu-3-0:amd64 \
             libgnomekbd-common libpam-gnome-keyring:amd64
    sudo apt remove --purge gnome-control-center-data gnome-control-center-faces gnome-desktop3-data gnome-initial-setup
    sudo apt remove --purge gnome-keyring-pkcs11:amd64 gnome-menus gnome-settings-daemon-schemas gnome-video-effects
    sudo apt remove --purge gnome-shell-common gnome-shell-extension-appindicator gnome-shell-extension-ubuntu-dock
    sudo apt remove --purge gnome-software gnome-software-common gnome-terminal-data gnome-todo-common

    The above remove eog
    sudo apt install eog
[/code]