/etc/passwd has changed during setup.
The new /etc/passwd md5sum is: 6a088063e333bd02bcb87a89f80390a8
--- /etc/passwd.orig	2016-07-13 10:40:59.227576469 +0000
+++ /etc/passwd	2016-07-13 10:42:49.342615728 +0000
@@ -28,3 +28,4 @@ docker:x:107:113::/nonexistent:/bin/fals
 syslog:x:108:114::/home/syslog:/bin/false
 dnsmasq:x:109:65534:dnsmasq,,,:/var/lib/misc:/bin/false
 tss:x:110:116::/var/lib/tpm:/bin/false
+uuidd:x:111:112::/run/uuidd:/bin/false
/etc/shadow has changed during setup.
The new /etc/shadow md5sum is: dc57e655b8c7cdecbb96535d2ed9bf6a
--- /etc/shadow.orig	2016-07-13 10:40:59.227576469 +0000
+++ /etc/shadow	2016-07-13 10:42:49.342615728 +0000
@@ -28,3 +28,4 @@ docker:*:16413:0:99999:7:::
 syslog:*:16521:0:99999:7:::
 dnsmasq:*:16644:0:99999:7:::
 tss:*:16701:0:99999:7:::
+uuidd:*:16995:0:99999:7:::
/etc/group has changed during setup.
--- /etc/group.orig	2016-07-13 10:40:59.231576515 +0000
+++ /etc/group	2016-07-13 10:42:49.342615728 +0000
@@ -2,7 +2,7 @@ root:x:0:
 daemon:x:1:
 bin:x:2:
 sys:x:3:
-adm:x:4:syslog
+adm:x:4:syslog,ubuntu
 tty:x:5:
 disk:x:6:
 lp:x:7:
@@ -52,3 +52,4 @@ syslog:x:114:
 pkcs11:x:115:root
 tss:x:116:
 input:x:107:
+uuidd:x:112:
/etc/gshadow has changed during setup.
--- /etc/gshadow.orig	2016-07-13 10:40:59.231576515 +0000
+++ /etc/gshadow	2016-07-13 10:42:49.342615728 +0000
@@ -2,7 +2,7 @@ root:*::
 daemon:*::
 bin:*::
 sys:*::
-adm:*::syslog
+adm:*::syslog,ubuntu
 tty:*::
 disk:*::
 lp:*::
@@ -52,3 +52,4 @@ syslog:!::
 pkcs11:!::root
 tss:!::
 input:!::
+uuidd:!::
There were changes to the password database,
please adjust the values in the livecd-rootfs source in the file:
live-build/ubuntu-core/hooks/00-uid-gid-fix.chroot_early

Please check also if a maintainer script of the package
that added these entries perhaps created a home directory and,
if needed, add code for creation of it to the above hook
E: config/hooks/99zz-check-uid-gid.chroot failed (exit non-zero). You should check for errors.