As the message say, avant-window-navigator can't be remove with add/remove menu because there is some depends on it than can't be handle by gnome-app-install (the software behind Add/Remove menu). Please use Synaptic to remove it. If you think it's a bug anyway, please report a bug against gnone-app-install instead.
Thanks for the bug report.
As the message say, avant-window- navigator can't be remove with add/remove menu because there is some depends on it than can't be handle by gnome-app-install (the software behind Add/Remove menu). Please use Synaptic to remove it. If you think it's a bug anyway, please report a bug against gnone-app-install instead.