It is recommended that you change your Debian 9 server user password every 3 months to ensure your security and that of your clients.
This is quite easy to do. There are a few simple steps to follow:
"e"."linux" and at the end of this line write: init=/bin/bash."Ctrl-X" or"F10" to perform the boot.mount -rw -o remount /"passwd name_user", where name_user is your user name, and all problems will be solved.As you can see, there is nothing complicated in changing the password.