Install atftp by entering the following commands in the terminal:
sudo apt update sudo apt install atftp
advanced TFTP client
Interactive client for the Trivial File Transfer Protocol (TFTP). Its usage is mainly for testing and debugging the Atftp server. TFTP client is usually implemented in BIOS and bootstraps programs like pxelinux when booting from LAN. Atftp also supports non-interactive invocation for easy use in scripts.