In the fix for bug 1513529, we[0] modified livecd-rootfs to write out a sources.list that matches the sources.list in Ubuntu Server installed from an ISO. We (presumably) compared to an Intel installation, and hard-coded security.ubuntu.com as a repo in sources.list.
Unfortunately, packages for non-Intel architectures aren't published to security.ubuntu.com; they are instead published at http://ports.ubuntu.com/ubuntu-ports/. That should be the URL that we configure as the source for $SUITE-security.
In the fix for bug 1513529, we[0] modified livecd-rootfs to write out a sources.list that matches the sources.list in Ubuntu Server installed from an ISO. We (presumably) compared to an Intel installation, and hard-coded security.ubuntu.com as a repo in sources.list.
Unfortunately, packages for non-Intel architectures aren't published to security. ubuntu. com; they are instead published at http:// ports.ubuntu. com/ubuntu- ports/. That should be the URL that we configure as the source for $SUITE-security.
[0] Well, *ahem*, _I_.