I booted with /etc/sysctl.conf as:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
That gave me no ipv6.
Then installing tftpd-hpa works just fine.
Just after install it has:
$ systemctl status tftpd-hpa
● tftpd-hpa.service - LSB: HPA's tftp server
Loaded: loaded (/etc/init.d/tftpd-hpa; bad; vendor preset: enabled)
Active: active (running) since Wed 2017-06-07 20:49:11 UTC; 13s ago
Docs: man:systemd-sysv-generator(8)
CGroup: /system.slice/tftpd-hpa.service
└─1918 /usr/sbin/in.tftpd --listen --user tftp --address :69
--secure /var/lib/tftpboot
Jun 07 20:49:11 x-tftpd systemd[1]: Starting LSB: HPA's tftp server...
Jun 07 20:49:11 x-tftpd tftpd-hpa[1907]: * Starting HPA's tftpd in.tftpd
Jun 07 20:49:11 x-tftpd tftpd-hpa[1907]: ...done.
Jun 07 20:49:11 x-tftpd systemd[1]: Started LSB: HPA's tftp server.
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https://bugs.launchpad.net/bugs/1474682
Title:
package tftpd-hpa 5.2+20140608-3ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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