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<p>The link you provided put me on the right track. At this url
there are three answers to the question how to disable
systemd-resolved in Ubuntu 17.04. The first answer says it also
works for Ubuntu 18.04. The instructions in the first answer
fixed the problem for me.</p>
<p><a class="moz-txt-link-freetext" href="https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu">https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu</a><br>
</p>
<p>Thanks to everyone who replied.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 12/7/18 10:21 PM, Michael Butash
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CADWnDsscTXsOxqtxQzC8sREEP=FOAPHLN=S68_XnFoahiopNLQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div dir="ltr">It's using a local dnsmasq server for caching,
akin to what windoze does, only it uses an external service
and not hidden behind the scenes. You can remove dnsmasq,
usually at least, and resolve direct against your dns servers,
I usually start by removing the package, as I've had enough
issues with it being weird, I tend to not like using it.
<div><br>
</div>
<div>I'm presuming 192.168.1.4 and 192.168.1.1 are valid dns
servers?</div>
<div><br>
</div>
<div>I'm having a weird issue that network manager has a bad
dns stuck in it somewhere that keeps causing me site delays
when it'll randomly put it back into my dns servers list as
first. It's not a setting I can find, or anything in /etc/,
I'm thinking something in gconf settings lost, but might be
something similar there if that 192.168.1.4 servers isn't
valid.</div>
<div><br>
</div>
<div>This might be useful to see what servers dnsmasq is
using.</div>
<div><br>
</div>
<div><a
href="https://askubuntu.com/questions/556852/how-can-i-tell-which-dns-servers-dnsmasq-is-using"
moz-do-not-send="true">https://askubuntu.com/questions/556852/how-can-i-tell-which-dns-servers-dnsmasq-is-using</a><br>
</div>
<div><br>
</div>
<div>-mb</div>
<div><br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Fri, Dec 7, 2018 at 7:44 PM Jim <<a
href="mailto:jim.nantz15@comcast.net" moz-do-not-send="true">jim.nantz15@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0

.8ex;border-left:1px #ccc solid;padding-left:1ex">Today I
noticed a problem when I use Thunderbird to check my email on
my <br>
Kubuntu 18.04 box. I got the following error in Thunderbird:
Failed to <br>
connect to <a href="http://imap.comcast.net" rel="noreferrer"
target="_blank" moz-do-not-send="true">imap.comcast.net</a>
However it will connect to <br>
<a href="http://imap.comcast.net" rel="noreferrer"
target="_blank" moz-do-not-send="true">imap.comcast.net</a>.
I also couldn't ping <a href="http://imap.comcast.net"
rel="noreferrer" target="_blank" moz-do-not-send="true">imap.comcast.net</a>.<br>
<br>
delboy@ladmo:~$ ping <a href="http://imap.comcast.net"
rel="noreferrer" target="_blank" moz-do-not-send="true">imap.comcast.net</a><br>
ping: <a href="http://imap.comcast.net" rel="noreferrer"
target="_blank" moz-do-not-send="true">imap.comcast.net</a>:
Name or service not known<br>
delboy@ladmo:~$<br>
<br>
In Network manager I have the following DNS servers in this
order: <br>
192.168.1.4 192.168.1.1, 8.8.8.8 8.8.4.4. I found this in
/etc/resolv.conf<br>
<br>
# Generated by NetworkManager<br>
nameserver 127.0.0.53<br>
<br>
If I change 127.0.0.53 to one of the DNS servers I have in
Network <br>
Manager, Thunderbird works again, but I'm not able to ping <br>
<a href="http://imap.comcast.net" rel="noreferrer"
target="_blank" moz-do-not-send="true">imap.comcast.net</a>.
I get the same error I mentioned earlier. I really <br>
don't care if I can ping it or not as long as Thunderbird can
connect to <br>
it. However when I reboot or restart Network Manager,
resolv.conf goes <br>
back to 127.0.0.3.<br>
<br>
Is there some bug with Network Manager or has comcast manged
to screw up <br>
something?<br>
<br>
thanks<br>
<br>
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