$ sudo add-apt-repository ppa:neovim-ppa/stable
$ sudo apt-get update
$ sudo apt-get install neovim
$ nvim

https://github.com/vim/vim/blob/master/runtime/tutor/tutor.ru

translated tutor for me

vimtutor command should pick up the current language env var.
Maybe try running LC_ALL=uk_UA.UTF-8 LANG=uk_UA.UTF-8 vimtutor.

Also, I strongly recommend getting used to Engish texts. When you'll need to google some errors, it'll have mostly misleading results for translated strings.

$ vimtutor

Error detected while processing command line:
E484: Can't open file /usr/share/nvim/runtime/tutor/tutor.vim

I will try to deal with the error

I found a tutor on the following path

/usr/share/nvim/runtime/tutor/en/vim-01-beginner.tutor

maybe something went wrong during installation

Oh, maybe your current locale points to some untranslated version...

Try LANG=en_US.UTF-8 vimtutor maybe

You probably installed a package without any translations.

Alright, it seems to be this bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=924389.
You probably need to also install Vim, just in case.

Oh, you can run nvim, then type :Tutor and hit <Enter> (Or just nvim +:Tutor)

Or just copy that tutorial file to some temporary location and open it with nvim.

Look what I've found: https://www.openvim.com/
you can go through that too