Broken package error ubuntu

[Cristian Ionescu-Idbohrn]

On Sat, 22 Mar 2014, Farzana Raisa wrote:
>
> Nothing is working. I tried every possible way but it is showing "W:
> GPG error: http://ftp.debian.org experimental Release: The following
> signatures couldn't be verified because the public key is not
> available: NO_PUBKEY 8B48AD6246925553" something like that

Then it's not ubuntu, it looks like a debian to me:

	http://ftp.debian.org

and you shouldn't use experimental packages, unless you know what that
is.  What is the output from these commands:

	$ cat /etc/debian_version

	$ cat /etc/apt/sources.list


Cheers,

-- 
Cristian