Op3r wrote:do you have internet connection on the machine you are installing it on?
Yes. I have internet connection and I have resolved the problem.
The problem was with the nameserver configuration. It should be properly configured at the time of installation.
I entered the wrong DNS address at the time of installation. After installation, I corrected the DNS address in resolv.conf. But after that it was very difficult to install the vici-install.sh. The package related to the installer vici-<something>.deb does not work after installation. I used aptitude to select the package, but it refused to accept.
I reinstalled the system, with correct DNS address and the installation was successful.