Comment 0 for bug 1659195

We had a bunch of test failures in our automatic tests for snapd since this ~Saturday (21.01.2017). All on core, all with errors like:
"""
error: cannot install "test-snapd-tools": Get https://search.apps.ubuntu.com/api/v1/snaps/details/test-snapd-tools?channel=stable&fields=anon_download_url%2Carchitecture%2Cchannel%2Cdownload_sha3_384%2Csummary%2Cdescription%2Cdeltas%2Cbinary_filesize%2Cdownload_url%2Cepoch%2Cicon_url%2Clast_updated%2Cpackage_name%2Cprices%2Cpublisher%2Cratings_average%2Crevision%2Cscreenshot_urls%2Csnap_id%2Csupport_url%2Ctitle%2Ccontent%2Cversion%2Corigin%2Cdeveloper_id%2Cprivate%2Cconfinement: dial tcp: lookup search.apps.ubuntu.com on [::1]:53: read udp [::1]:41766->[::1]:53: read: connection refused
"""

The key here is the: "dial tcp: lookup search.apps.ubuntu.com on [::1]:53: read udp [::1]:41766->[::1]:53: read: connection refused". It was random but in the ~150 integration tests we run for the core image we had about 5 of those everytime. Further debugging yielded that the /etc/resolv.conf is empty when the errors happen.

It looks like the fix for https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1649931 is causing this behaviour for us. Reverting this change gave us stable tests again. I also tried to update to the latest resolvconf (the one that is reference in #1649931 and also in the followup bug #1649931). Using this resolvconf improved the situation dramatically. However we still got these errors from time to time with just updating resolvconf to the version in xenial-proposed. With the revert of #1649931 we have no prolbems so far in our test.

If there is anything I can try in our image PPA to help with a fix I will be happy to do that.

Thanks,
 Michael