Can't start using the OS because username must be typed in Latin

[ghost]

During installation of Vanilla OS I picked English and Russian keyboard layouts. After I rebooted, I was asked to choose my preferred keyboard layout and I chose Russian since it's my main language. Despite the fact that I chose both English and Russian layouts during installation, English wasn't available when I tried to create a new user account. Since username must be typed in Latin letters, I can't create a new user and can't use the OS.

[ghost]

Choosing a different keyboard layout does nothing, by the way. I can only type in Russian, regardless of which layout I choose.

[muhdsalm]

To confirm, changing the keyboard layout via the switcher in the top right does not actually change the keyboard?