Thanks for reporting this bug.
Looking at the log, it seems that there is a local config error in
/etc/default/tftpd-hpa (line 6?). Marking Invalid, if this is not the
case - please update the bug as appropriate.
Setting up tftpd-hpa (5.0-21ubuntu2) ...
/etc/default/tftpd-hpa: 6: Syntax error:
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https://bugs.launchpad.net/bugs/827755
Title:
package tftpd-hpa 5.0-21ubuntu2 failed to install/upgrade: subprocess
installed post-installation script returned
