Install atftpd by entering the following commands in the terminal:
sudo apt update sudo apt install atftpd
advanced TFTP server
Multi-threaded TFTP server implementing all options (option extension and multicast) as specified in RFC1350, RFC2090, RFC2347, RFC2348 and RFC2349. Atftpd also supports multicast protocol known as mtftp, defined in the PXE specification. The server supports being started from inetd(8) as well as in daemon mode using init scripts.