How do you mine in Ubuntu 11.04? Are there any GUI miners like poclbm-gui for Ubuntu?
GUIminer can be run on linux, although the process (described in the official thread) is somewhat complicated. To summarise that post, you will need to:
Get the source code from GitHub:
git clone https://github.com/Kiv/poclbm
sudo apt-get install python-wxtools
Note that (at least to use the poclbm backend) no compiling is necessary since GUIminer is written in python. But I can still understand if you find that process a little daunting, since I don't know your level of technological familiarity with these sorts of tasks.