I first tried Ubuntu 12.10 from the Live USB and then eith Virtual Box. In both cases I was able to connect to my google Account from Gwibber.
But now I have done a clean install, but am not able to connect at all.
I get a rotating circle, which just keeps on going.
I am using a proxy server whose details I have given in the Network Proxy settings. I have also set up the http_proxy, https_proxy and ftp_proxy variables.