Howtoforge posted a guide about installing clients for Twitter under Ubuntu Linux 8.04
>> Twitter Clients For Ubuntu 8.04 Desktop
In this article I will show how to install and use two clients for the popular microblogging platform Twitter on an Ubuntu 8.04 desktop. The first one is Twitux, the second Twitter client is gtwitter. Both clients have similar features, so it is up to you which one you want to install.
>> Twitter Clients For Ubuntu 8.04 Desktop