Hi, My question is that can we install .deb packages on ubuntu 11.10 offline??? I want install deb package without an internet connection... so kindly guide me about this situation..
You can do that, but first you need to download the files from repositories and make sure you are satisfying all the dependencies, once you have all the files you can use dpkg for example:
dpkg -i package_name.deb
For more info type man dpkg or dpkg --help.