Just tested here and confirmed that tftpd-hpa installs and runs
perfectly fine on both a clean Ubuntu 14.04 and Ubuntu 16.04 system with
its default configuration.

Changing from "[::]" to "0.0.0.0" is completely wrong as that turns off
IPv6 support for tftpd-hpa which people do need.


My best guess as to why some folks need to do that change is because they 
somehow turned off IPv6 on their system, which then causes any daemon that's 
configured to bind both IPv4 and IPv6 to fail.

While it'd be nice if tftpd-hpa dealt with such setups a bit nicer,
turning off IPv6 support on Ubuntu isn't something that we actively
support (understand, that it's at your own risk) and such regressions
are absolutely to be expected in such cases.


I've confirmed the following:
 - An Ubuntu 14.04 system with IPv6 enabled and no IPv6 address works fine
 - An Ubuntu 16.04 system with IPv6 enabled and no IPv6 address works fine
 - An Ubuntu 14.04 system with IPv6 disabled fails as described in this bug 
report
 - An Ubuntu 16.04 system with IPv6 disabled fails as described in this bug 
report

And for good measure:
 - An Ubuntu 14.04 system with IPv6 enabled and an IPv6 address works fine too
 - An Ubuntu 16.04 system with IPv6 enabled and an IPv6 address works fine too


There may still be some kind of race in tftpd-hpa which I'm not hitting here 
and that would cause it to only work after a little while (similar to the other 
bug which was referenced here).
But if it's not working at all and only works after you change it to bind 
0.0.0.0, that's most likely because you reconfigured your system's networking 
in a way we don't support.

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https://bugs.launchpad.net/bugs/1342580

Title:
  tftpd-hpa doesn't start on boot

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