To search some package you can use this:
apt-cache search <package>
so if you find the pack you can use the command of @bkth to install. For another packs that not in list I suggest you find how to install for each extension, like .tar .tar.gz .rpm… Some packs are a litlle hard to install and you will must read the read me file to understand, but in google you will find help in this specific cases.
Another hint, if you want update use this:
apt-get update
apt-get upgrade