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I have a fresh installation of Ubuntu Server 16.04 LTS (Xenial Xerus).

I added this to /etc/network/interfaces to assign an IPv4 address:

auto enp2s0
iface enp2s0 inet static
 address 192.168.1.100
 netmask 255.255.255.0
 gateway 192.168.1.1

However, the interface gets an IPv6, too. I don't know where it is coming from. There shouldn't be any IPv6 in this network, but I can't deny the possibility that some device is trying to assingn IP addresses, which is why I did not enable DHCP.

Now this seems to trigger AAAA instead of A lookups which prevents me from doing an apt-get update:

Cannot initiate the connection to th.archive.ubuntu.com:80 (2001:3c8:9009:81::101:34). - connect (101: Network is unreachable) [IP: 2001:3c8:9009:81::101:34 80]

What to do?

AndreKR
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    @Ravexina Ok, yes, that would probably solve my apt-get problem but I guess other software will have the same problem, so I am looking for a solution that solves the root of the problem. – AndreKR May 05 '17 at 17:52
  • Could you please open a new question if you have a new or follow-up question? The comment section is not suitable or meant for new questions or extended discussion. You’re welcome to send me a comment with a notification to draw my attention to it. Thanks. – David Foerster May 09 '17 at 05:49

1 Answers1

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Update:

Since you're running Ubuntu Server, then please see Disabling IPv6 on a single interface. And, you'll also want to add dns-nameservers to your interfaces file.

If you're running standard Ubuntu, then delete your changes to /etc/network/interfaces and setup a standard network connection profile to use DHCP to set your address (or manually set an address if you must) and DNS servers (comma-separated list), in the IPv4 tab, and set your IPv6 tab to Ignore...

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You can also try another server instead of th.archive.ubuntu.com.

heynnema
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  • How do I do that using the command line? I don't have X. – AndreKR May 05 '17 at 18:12
  • Aren't you running standard Ubuntu? To disable IPv6 you can see https://askubuntu.com/questions/316492/disabling-ipv6-on-a-single-interface (and you'll also want to add dns-nameservers to your interfaces file). – heynnema May 05 '17 at 18:27
  • Ubuntu Server, I edited that into the question. – AndreKR May 06 '17 at 08:44