*** This bug is a duplicate of bug 1671606 ***
https://bugs.launchpad.net/bugs/1671606
I have a similar problem. I tried rolling back the network manager from
1.2.6-0ubuntu0.16.04.1 to 1.2.2-0ubuntu0.16.04.4. Oddly, it seemed to fix DNS
for a few minutes, but it reverted to not working.
I noticed that a few days before the network manager was updated
resolvconf also updated. I believe resolvconf is responsible for
notifying applications (like the local resolver) when something like a
DHCP lease gets established and a new DNS server is needs to be pointed
to.
I downgraded resolvconf from 1.78ubuntu4 to 1.78ubuntu2 and this seems
to have fixed my problem.
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https://bugs.launchpad.net/bugs/1671964
Title:
DNS fails after reconnecting to a VPN
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
Since update 1.2.2-0ubuntu0.16.04.3 of network-manager, when I
reconnect (i.e. connect, disconnect, connect) to a VPN (OpenVPN), DNS
resolution stops working.
Workaround: systemctl restart NetworkManager
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https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1671964/+subscriptions
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