Hi Christian,
I tried the alternative command, but I am getting error in that for connecting to the host.
The error logs are as follows

gpg: directory `/home/bagggami/.gnupg' created
gpg: new configuration file `/home/bagggami/.gnupg/gpg.conf' created
gpg: WARNING: options in `/home/bagggami/.gnupg/gpg.conf' are not yet active during this run
gpg: keyring `/home/bagggami/.gnupg/secring.gpg' created
gpg: keyring `/home/bagggami/.gnupg/pubring.gpg' created
gpg: requesting key 7BE1F97B from hkp server keyserver.ubuntu.com
gpgkeys: HTTP fetch error 7: couldn't connect to host
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

Can you tell me whats going wrong here.

Regards,
Amit Bag

On 16/02/12 12:57, Christian Robottom Reis wrote:

On Thu, Feb 16, 2012 at 12:49:21PM +0530, Amit wrote:

I am not able to install any packages related to linaro for example
when I tried that below command

sudo add-apt-repository ppa:linaro-maintainers/toolchain
I am getting error like
Error reading
https://launchpad.net/api/1.0/~linaro-maintainers/+archive/toolchain:
<urlopen error [Errno 111] Connection refused>

But when I use a direct INTERNET connection without proxy its working
fine.

The problem you're running into is that add-apt-repository is fetching a
GPG key from the Ubuntu keyserver, which is running on port 11371.  You
can indeed punch a hold in the firewall, but you can also just issue

    sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7BE1F97B

since this is a one-time operation -- once the key is set up
transferring packages is done over regular http.