Ubuntu and touch screen keyboard on login

Laptop Dell Latitude XT2 has touch screen, OS - Ubuntu.
ToDo - login without hardware keyboard


Install lightdm-gtk-greeter

edit config file - /etc/lightdm/lightdm-gtk-greeter-ubuntu.conf
add/edit line in section [greeter]

keyboard=onboard
indicators=~a11y;~language;~session;~power;~clock
show-clock=true
clock-format=%H:%M

reboot

In result, we can use icon accessibility for activate virtual keyboard.