Comment 11 for bug 1603620

Also having this problem.

Software Updater never automatically launches even if I ask for immediate display of available updates.

Unattended-upgrades never installs anything.

After forcing a reload of package info then rebooting the next day, I got errors from unattended-upgrades:
2016-11-29 21:06:13,620 ERROR An error occurred: 'Could not resolve 'ubuntu.mirrors.skynet.be''
2016-11-29 21:06:13,621 ERROR The URI 'http://security.ubuntu.com/ubuntu/pool/main/g/gst-plugins-good1.0/gstreamer1.0-plugins-good_1.8.3-1ubuntu1.2_amd64.deb' failed to download, aborting

Looks like both Software Updater and unattended-upgrades are launched before my network is up.