After a fresh install of 17.04 on LG latop, PC connects to Wifi correctly but can not access to the internet.

  1. I tried 2 different Wifi 's
  2. PC connects correctly to NAS on network
  3. PC connects to Router's web page.
  4. Update: Problems persists using Ethernet ( Wifi is Off )

What can it be ?

PC is LG Laptop 2 core Dou, 2GB of ram, 80GB HD ( OLD but working properly )

  • Are there any problems with DNS? Please edit your question to add the result of these terminal commands: ping -c3 and also: cat /var/log/syslog | grep -i dns
    – chili555
    Jul 31, 2017 at 19:27
  • @chili555 , ping is OK , syslog - " DNSSEC validation failed for question..... : failed auxiliry " what does it mean ??
    – guyd
    Aug 1, 2017 at 4:38

2 Answers 2


Go to network settings.

In wireless settings, you'd find an IPv6 tab.

Put it on Ignore

  • I did and it is ok!!!
    – guyd
    Jul 31, 2017 at 19:40
  • something is not working again IPv6 is ignored
    – guyd
    Aug 1, 2017 at 4:23
  • Yea, there's some bug in 17.04 Please follow this link Aug 1, 2017 at 7:07

Your issue, a failure of DNSSEC, is the subject of several bug reports; for instance: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1682499 and this: https://superuser.com/questions/1153203/ubuntu-17-04-systemd-resolved-dns-lookups-randomly-fail/1200745#1200745

I recommend that you undertake the fix in the second link:

sudo mkdir -p /etc/systemd/resolved.conf.d
printf "[Resolve]\nDNSSEC=no\n" | sudo tee /etc/systemd/resolved.conf.d/no-dnssec.conf

Reconfigure resolvconf if needed:

sudo dpkg-reconfigure resolvconf

Say yes to "prepare /etc/resolve.conf for dynamic updates?" and reboot.

  • /usr/sbin/dpkg-reconfigure: resolved.conf is not installed Nov 16, 2018 at 12:09
  • @Trix Please start your own new question.
    – chili555
    Nov 16, 2018 at 12:23

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