http://www.guiadohardware.net/guias/01/index5.php
"é preciso instalar o pacote "tftpd-hpa", substituindo o tftpd "normal" que instalamos inicialmente. Nos derivados do Debian ele está disponível via apt-get:"
You need to install the "tftpd-hpa" package, replacing the "normal" tftpd that we initially installed. In Debian and its derivatives it is available via apt-get.
(I hope not being punished for posting something in non-English
)
Greetings and may the Source be with you.