I installed Ubuntu 17.04 as a VirtualBox guest and I have the same problem:
syslog output:
systemd-resolved[947]: DNSSEC validation failed for question . in DNSKEY: 
missing-key
systemd-resolved[947]: DNSSEC validation failed for question com in DS: 
missing-key
systemd-resolved[947]: DNSSEC validation failed for question com in DNSKEY: 
missing-key
systemd-resolved[947]: DNSSEC validation failed for question ubuntu.com in DS: 
missing-key
systemd-resolved[947]: DNSSEC validation failed for question ubuntu.com in SOA: 
missing-key
systemd-resolved[947]: DNSSEC validation failed for question apps.ubuntu.com in 
DS: missing-key
systemd-resolved[947]: DNSSEC validation failed for question 
search.apps.ubuntu.com in DS: missing-key
systemd-resolved[947]: DNSSEC validation failed for question 
search.apps.ubuntu.com in SOA: missing-key
systemd-resolved[947]: DNSSEC validation failed for question 
search.apps.ubuntu.com in A: missing-key

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https://bugs.launchpad.net/bugs/1650927

Title:
  accessing local ethernet is possible, accessing internet is not
  possible (Ubuntu MATE 17.04, ppc)

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