Jtdcftul

I recently upgraded my ubuntu and suddenly lost DNS. By the looks of it, its related to https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674532. But I cannot run the update to fix the issue because it can't use DNS to conduct the update. Is there any documentation out there on how to get the DNS working again so i can run the update and fix the issue? I have tried changing the DNS server and everything and nothing is working.

cat /etc/resolv.conf

nameserver 8.8.8.8  

nameserver 8.8.4.4

cat /etc/NetworkManager/NetworkManager.conf

[main]  

plugins=ifupdown,keyfile,ofono  

dns=dnsmasq



[ifupdown]  

managed=false

dpkg -l dns | grep ii

ii avahi-dns confd      0.6.32~rc+dfsg-1ubuntu2 amd64   Avahi DNS configuration tool  

ii dnsmasq-base         2.75-1ubuntu0.16.04.1   amd64   Small caching DNS proxy and DHCP/TFTP Server  

ii dnsutils             1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   Clients Provided with BIND  

ii libavahi-compact-libdnssd1:amd64    0.6.32~rc+dfsg-1ubuntu2   amd64   Avahi Apple Bonjour compatibility library  

ii libdns-export162     1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   Exported DNS Shared Library  

ii libdns162:amd64      1:9.10.3.dfsg.p4-8ubuntu1.5 amd64   DNS Shared Library used by BIND  

ii libnss-mdns:amd64    0.10-7     amd64     NSS Module for Multicast DNS name resolution  

host -v www.apple.com

Trying "www.apple.com"  

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1102  

;; flags: qr rd ra; QUERY: 1; ANSWER: 4; AUTHORITY: 0, ADDITIONAL: 0  



;;QUESTION SECTION:  

;www.apple.com.     IN      A  



;;ANSWER SECTION:  

www.apple.com.  1126    IN  CNAME   www.apple.com.edgekey.net.  

www.apple.com.edgekey.net.  21568   IN  CNAME   www.apple.com.edgekey.net.globalredir.akadns.net  

www.apple.com.edgekey.net.globalredir.akadns.net.   3599    IN  CNAME   e6858.dsce9.akamaiedge.net

e6858.dsce9.akamaiedge.net. 19  IN  A   172.226.108.101



Received 182 bytes from 8.8.8.8#53 in 152 ms  

Trying "e6858.dsce9.akamaiedge.net"  

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:428  

;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY:0, ADDITIONAL: 0  



;;QUESTION SECTION  

;e6858.dsce9.akamaiedge.net.    IN  AAAA  



;;ANSWER SECTION:  

e6858.dsce9.akamaiedge.net. 19  IN  AAAA    2001:559:19:988d::1aca  

e6858.dsce9.akamaiedge.net. 19  IN  AAAA    2001:559:19:988d::1aca  



Received 100 bytes from 8.8.8.8#53 in 70 ms  

Trying "e6858.dsce9.akamaiedge.net"  

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:34978  

;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY:1, ADDITIONAL: 0  



;;QUESTION SECTION:  

;e6858.dsce9.akamaiedge.net.    IN  MX  



;;AUTHORITY SECITON:  

dsce9.akamaiedge.net.   179 IN  SOA n0dsce9.akamaiedge.net.   hostmaster.akamai.com.    1490629947 1000 1000 1000 1800  



Received 109 bytes from 8.8.8.8#53 in 32 ms  

dpkg -l | grep libc6

ii libc6:amd64  2.23-0ubuntu7   amd64   GNU C Library: Shared Libraries  

ii libc6-dev:amd64  2.23-0ubuntu7   amd64   GNU C Library: Development Libraries and Header Files

The file that stores information about what DNS servers to consult when resolving domain names is /etc/resolv.conf. But the problem with this file is that it is strongly advised not to edit that file by hand because if you do, it's soon going to be automatically overwritten by the resolvconf program. What you can do, however, is add the following lines to the /etc/resolvconf/resolv.conf.d/head file:

# Google's public DNS servers

nameserver 8.8.8.8    # Primary DNS server

nameserver 8.8.4.4    # Secondary DNS server

This file is used when constructing /etc/resolv.conf. Specifically, its contents are added to the beginning of the /etc/resolv.conf file.

When the update will solve the problem it should not be too difficult to achieve that without DNS.
Maybe a workaround is to find out out the IP address of your update server and enter that into your /etc/apt/sources.list instead of the fully qualified domain name.