packages cannot be authenticated! - traceroute

Question

I am trying to install traceroute in ubuntu and I am getting the following message.

sudo apt-get install traceroute
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  traceroute
0 upgraded, 1 newly installed, 0 to remove and 6 not upgraded.
Need to get 53.1 kB of archives.
After this operation, 162 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  traceroute
Install these packages without verification [y/N]? n
E: Some packages could not be authenticated

but when I install on my friend's system, it works fine.

sudo apt-get install traceroute
[sudo] password for ankit: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  traceroute
0 upgraded, 1 newly installed, 0 to remove and 12 not upgraded.
Need to get 53.1 kB of archives.
After this operation, 162 kB of additional disk space will be used.
Get:1 http://in.archive.ubuntu.com/ubuntu/ precise/universe traceroute amd64 1:2.0.18-1 [53.1 kB]
Fetched 53.1 kB in 1s (28.8 kB/s)     
Selecting previously unselected package traceroute.
(Reading database ... 207690 files and directories currently installed.)
Unpacking traceroute (from .../traceroute_1%3a2.0.18-1_amd64.deb) ...

[1]+  Stopped                 sudo apt-get install traceroute

What is wrong in my system?

Thanks in advance.

Answer 1

That message appears when your software is not up to date. So do a ...

sudo apt-get update

and do the install again; the notice should be gone.