This doesn't look to me like a bug in nfs-kernel-server, but some wrong output on the debconf pipe that has put things in a wrong state. Reassigning to debconf, though I suspect this is actually a bug in something earlier in the mythbuntu installer.
The error in the logs is: Creating config file /etc/default/nfs-common with new version Adding system user `statd' (UID 105) ... Adding new user `statd' (UID 105) with group `nogroup' ... Not creating home directory `/var/lib/nfs'. statd start/running, process 31958 gssd stop/pre-start, process 31991 idmapd start/running, process 32098 Setting up nfs-kernel-server (1:1.2.5-3ubuntu3) ... Use of uninitialized value $_[1] in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111, <GEN0> line 13. Use of uninitialized value $val in substitution (s///) at /usr/share/perl5/Debconf/Format/822.pm line 83, <GEN1> line 9. Use of uninitialized value $val in concatenation (.) or string at /usr/share/perl5/Debconf/Format/822.pm line 84, <GEN1> line 9. Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66. Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67. Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68. Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66. Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67. Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68. Use of uninitialized value $reply in scalar chomp at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 66. Use of uninitialized value $reply in concatenation (.) or string at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 67. Use of uninitialized value $reply in split at /usr/share/perl5/Debconf/FrontEnd/Passthrough.pm line 68. Creating config file /etc/default/nfs-kernel-server with new version dpkg: error processing nfs-kernel-server (--configure): subprocess installed post-installation script returned error exit status 128 ** Package changed: nfs-utils (Ubuntu) => debconf (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/996712 Title: package nfs-kernel-server 1:1.2.5-3ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debconf/+bug/996712/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
