Why is VIM running in read-only mode?

Question

linux

I am connected via ssh(KiTTY) to debian 8 jessy. To make it easier to launch files, I use xdg-open. Installed the vim.basic editor with update-alternatives --config editor and set the .bashrc config to:

export VISUAL=vim(пробовал и nano, но без изменений)
 export EDITOR="$VISUAL"

But when I try to open a txt file with xdg-open, END appears at the bottom of the page and I cannot switch to INSERT mode. What is it connected with?
And one more question: how to configure the default programs for xdg in general, since this problem is also present with other files, and little is clear from the documentation.