Fails with "Temporary failure resolving ..."

UCK fails saying it can't talk to the outside world, though I'm having no other connectivity problems (e.g. "ping archive.ubuntu.com" works just fine). It doesn't seem to matter whether I choose to "customize the CD manually during building".

This is my first time trying UCK, so I'm not sure what else to say.

My ~/tmp/build.log follows. Thanks for any help you can provide!

Build (/usr/bin/uck-gui --wait-before-exit) started at 2016-10-16 17:29:26
>> Ubuntu Customization Kit 2.4.7 on Ubuntu 16.10, 4.8.0-22-generic x86_64
Starting CD remastering on Sun Oct 16 17:29:43 EDT 2016
Customization dir=/home/macho/tmp/customization-scripts
Mounting ISO image...
mount: /dev/loop0 is write-protected, mounting read-only
Unpacking ISO image...
Unmounting ISO image...
Mounting SquashFS image...
Unpacking SquashFS image...
Unmounting SquashFS image...
Creating apt cache...
Creating root home...
Mounting /proc
Mounting /sys
Mounting /dev/pts
Mounting /tmp
Mounting /home/macho/tmp/remaster-root-home
Mounting /home/macho/tmp/remaster-apt-cache
Mounting /run
Mounting /home/macho/tmp/customization-scripts
Copying fstab/mtab...
Creating DBUS uuid...
Creating user directory...
Copying X authorization file to chroot filesystem...
xauth: file /root/.Xauthority does not exist
xauth: file /home/macho/.Xauthority does not exist
Deactivating initctl...
Deactivating update-grub...
Deactivating grub-probe...
Hacking grub-probe postinst/postrm...
Remembering kernel update state...
>> Customizing: Ubuntu 16.10, 4.8.0-22-generic x86_64
Err:1 http://archive.ubuntu.com/ubuntu yakkety InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu yakkety-security InRelease
  Temporary failure resolving 'security.ubuntu.com'
Err:3 http://archive.ubuntu.com/ubuntu yakkety-updates InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Reading package lists...
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/yakkety/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/yakkety-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/yakkety-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
Installing language packs (en
es
fr)...
Reading package lists...
Building dependency tree...
Reading state information...
language-pack-en is already the newest version (1:16.10+20161009).
language-pack-en-base is already the newest version (1:16.10+20161009).
language-pack-es is already the newest version (1:16.10+20161009).
language-pack-es-base is already the newest version (1:16.10+20161009).
language-pack-fr is already the newest version (1:16.10+20161009).
language-pack-fr-base is already the newest version (1:16.10+20161009).
language-pack-gnome-en is already the newest version (1:16.10+20161009).
language-pack-gnome-en-base is already the newest version (1:16.10+20161009).
language-pack-gnome-es is already the newest version (1:16.10+20161009).
language-pack-gnome-es-base is already the newest version (1:16.10+20161009).
language-pack-gnome-fr is already the newest version (1:16.10+20161009).
language-pack-gnome-fr-base is already the newest version (1:16.10+20161009).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Removing unnecessary language packages...
Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be REMOVED:
  firefox-locale-de* firefox-locale-it* firefox-locale-pt* firefox-locale-ru*
  firefox-locale-zh-hans* language-pack-de* language-pack-de-base*
  language-pack-gnome-de* language-pack-gnome-de-base* language-pack-gnome-it*
  language-pack-gnome-it-base* language-pack-gnome-pt*
  language-pack-gnome-pt-base* language-pack-gnome-ru*
  language-pack-gnome-ru-base* language-pack-gnome-zh-hans*
  language-pack-gnome-zh-hans-base* language-pack-it* language-pack-it-base*
  language-pack-pt* language-pack-pt-base* language-pack-ru*
  language-pack-ru-base* language-pack-zh-hans* language-pack-zh-hans-base*
0 upgraded, 0 newly installed, 25 to remove and 0 not upgraded.
After this operation, 123 MB disk space will be freed.
(Reading database ...
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(Reading database ... 95%
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(Reading database ... 184869 files and directories currently installed.)
Removing firefox-locale-de (49.0+build4-0ubuntu2) ...
Removing firefox-locale-it (49.0+build4-0ubuntu2) ...
Removing firefox-locale-pt (49.0+build4-0ubuntu2) ...
Removing firefox-locale-ru (49.0+build4-0ubuntu2) ...
Removing firefox-locale-zh-hans (49.0+build4-0ubuntu2) ...
Removing language-pack-gnome-de-base (1:16.10+20161009) ...
Removing language-pack-de-base (1:16.10+20161009) ...
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_AT" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_BE" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_CH" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_DE" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_IT" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_LI" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "de_LU" not in archive
Removing language-pack-gnome-it-base (1:16.10+20161009) ...
Removing language-pack-gnome-pt-base (1:16.10+20161009) ...
Removing language-pack-gnome-ru-base (1:16.10+20161009) ...
Removing language-pack-gnome-zh-hans-base (1:16.10+20161009) ...
Removing language-pack-it-base (1:16.10+20161009) ...
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "it_CH" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "it_IT" not in archive
Removing language-pack-pt-base (1:16.10+20161009) ...
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "pt_BR" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "pt_PT" not in archive
Removing language-pack-ru-base (1:16.10+20161009) ...
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "ru_RU" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "ru_UA" not in archive
Removing language-pack-zh-hans-base (1:16.10+20161009) ...
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "zh_CN" not in archive
/usr/share/locales/remove-language-pack: 13: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
/usr/share/locales/remove-language-pack: 17: /usr/share/locales/remove-language-pack: cannot create /dev/null: Permission denied
locale "zh_SG" not in archive
Removing language-pack-gnome-de (1:16.10+20161009) ...
Removing language-pack-de (1:16.10+20161009) ...
Removing language-pack-gnome-it (1:16.10+20161009) ...
Removing language-pack-gnome-pt (1:16.10+20161009) ...
Removing language-pack-gnome-ru (1:16.10+20161009) ...
Removing language-pack-gnome-zh-hans (1:16.10+20161009) ...
Removing language-pack-it (1:16.10+20161009) ...
Removing language-pack-pt (1:16.10+20161009) ...
Removing language-pack-ru (1:16.10+20161009) ...
Removing language-pack-zh-hans (1:16.10+20161009) ...
Processing triggers for bamfdaemon (0.5.3+16.10.20160929-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Can't open /dev/null: Permission denied
(Reading database ...
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(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 176821 files and directories currently installed.)
Removing language-pack-pt-base (1:16.10+20161009) ...
Purging configuration files for language-pack-pt-base (1:16.10+20161009) ...
Removing language-pack-ru-base (1:16.10+20161009) ...
Purging configuration files for language-pack-ru-base (1:16.10+20161009) ...
Removing language-pack-gnome-zh-hans-base (1:16.10+20161009) ...
Purging configuration files for language-pack-gnome-zh-hans-base (1:16.10+20161009) ...
Removing language-pack-gnome-pt-base (1:16.10+20161009) ...
Purging configuration files for language-pack-gnome-pt-base (1:16.10+20161009) ...
Removing language-pack-gnome-de-base (1:16.10+20161009) ...
Purging configuration files for language-pack-gnome-de-base (1:16.10+20161009) ...
Removing language-pack-zh-hans-base (1:16.10+20161009) ...
Purging configuration files for language-pack-zh-hans-base (1:16.10+20161009) ...
Removing language-pack-de-base (1:16.10+20161009) ...
Purging configuration files for language-pack-de-base (1:16.10+20161009) ...
Removing language-pack-gnome-ru-base (1:16.10+20161009) ...
Purging configuration files for language-pack-gnome-ru-base (1:16.10+20161009) ...
Removing language-pack-gnome-it-base (1:16.10+20161009) ...
Purging configuration files for language-pack-gnome-it-base (1:16.10+20161009) ...
Removing language-pack-it-base (1:16.10+20161009) ...
Purging configuration files for language-pack-it-base (1:16.10+20161009) ...
sh: 1: cannot create /dev/null: Permission denied
sh: 1: cannot create /dev/null: Permission denied
W: --force-yes is deprecated, use one of the options starting with --allow instead.
E: Problem executing scripts DPkg::Post-Invoke '/usr/bin/test -e /usr/share/dbus-1/system-services/org.freedesktop.PackageKit.service && /usr/bin/test -S /var/run/dbus/system_bus_socket && /usr/bin/gdbus call --system --dest org.freedesktop.PackageKit --object-path /org/freedesktop/PackageKit --timeout 4 --method org.freedesktop.PackageKit.StateHasChanged cache-update > /dev/null; /bin/echo > /dev/null'
E: Sub-process returned an error code
apt-get remove firefox-locale-de firefox-locale-it firefox-locale-pt firefox-locale-ru firefox-locale-zh-hans language-pack-de language-pack-de-base language-pack-gnome-de language-pack-gnome-de-base language-pack-gnome-it language-pack-gnome-it-base language-pack-gnome-pt language-pack-gnome-pt-base language-pack-gnome-ru language-pack-gnome-ru-base language-pack-gnome-zh-hans language-pack-gnome-zh-hans-base language-pack-it language-pack-it-base language-pack-pt language-pack-pt-base language-pack-ru language-pack-ru-base language-pack-zh-hans language-pack-zh-hans-base failed, error=100
Restoring kernel update state...
Reactivating initctl...
Reactivating update-grub...
Reactivating grub-probe...
Reactivating grub-probe postinst/postrm...
Removing /home/username directory...
Removing generated machine uuid...
Removing generated fstab/mtab...
Removing crash reports...
Unmounting /home/macho/tmp/remaster-root/var/cache/apt...
Unmounting /home/macho/tmp/remaster-root/tmp/customization-scripts...
Unmounting /home/macho/tmp/remaster-root/tmp...
Unmounting /home/macho/tmp/remaster-root/sys...
Unmounting /home/macho/tmp/remaster-root/run...
Unmounting /home/macho/tmp/remaster-root/root...
Unmounting /home/macho/tmp/remaster-root/proc...
Unmounting /home/macho/tmp/remaster-root/dev/pts...
Cleaning up temporary directories...
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Build ended at 2016-10-16 17:33:34