Ubuntu: tftp error code 2 access violation (tftp not working) (4 Solutions!!)

Ubuntu: tftp error code 2 access violation (tftp not working) (4 Solutions!)

[VeniceInventors]

Had a similar issue on raspberry pi using tftpd and tftp locally to test.
Here tftpd runs as user nobody, inetd runs as root, and even when running tftpd as root it still failed.
What worked for me, instead of changing the files permission was to set the folders permission to 777 (755 and 644 didn't work).
So after setting each folder from /data to /data/nfs/pi3/rootfs/boot/ to 777 I was finally able to access the files without having to change their permission.
(my whole rootfs directory here is also used with nfs and needs to keep the file permissions intact)