Yes. Kopete, Empahy, and Pidgin all have voice chat support for various protocols. There is also a port of Skype to Ubuntu.
google chat
Yes, Google chat is completely free of cost. It does not cost any kind of money. Google Chat is also known as Hangouts.
You could easily download Chrome for Ubuntu OS. It is available on the Chrome website as well.
You can get Google Chat of yesterday. It is there in the chat box of the person you chatted. Click on the contact and you will get it back.
In google it is reffered to as the google talk application. with google talk you are free to invite people to chat in a chat room...
Support for Google voice and video chat can be found in the support section of the Google pages. Google offer several help pages to answer many questions about Google voice and video chat.
yes you do you can have a video chat aswell
Internally, Google uses a variety of operating systems including Windows, OSX, Linux, Android, and ChromeOS. Google's preferred flavor of Linux for server hosting is a descendant of Ubuntu, called Goobuntu.
Chatting on Gmail is done through their IM. The name of IM of Google is Google Hangouts. It can be used for chatting to friends or groups.
I have used ubuntu for 4 years and not regretted a second of it.
MIcrosoft corporation,Google,Ubuntu,Fedora