I was setting up a server as in the below link https://help.ubuntu.com/community/Dnsmasq
root@user-desktop:/etc/init.d# sudo apt-get install dnsmasq
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
dnsmasq
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/15.4 kB of archives.
After this operation, 120 kB of additional disk space will be used.
Selecting previously unselected package dnsmasq.
(Reading database ... 146283 files and directories currently installed.)
Unpacking dnsmasq (from .../dnsmasq_2.59-4_all.deb) ...
Processing triggers for ureadahead ...
Setting up dnsmasq (2.59-4) ...
* Starting DNS forwarder and DHCP server dnsmasq
dnsmasq: failed to create listening socket for port 53: Address already in use [fail]
invoke-rc.d: initscript dnsmasq, action "start" failed.