Since Bean, author of Burg, has not yet made available any repository for Ubuntu 11.04, waiting for new developments you can use some repository created by Nate Muench for Natty. Keep in mind that using this repository is equivalent to use Maverick repository for Burg by Bean because it contains exactly the same packages.
Nate Muench repository for Burg are this:
deb http://ppa.launchpad.net/n-muench/burg/ubuntu/ natty main
deb-src http://ppa.launchpad.net/n-muench/burg/ubuntu/ natty main
If you want to add it to your sources.list you can execute from terminal:
sudo add-apt-repository ppa:n-muench/burg
Then if you want to install burg execute:
sudo apt-get update && sudo apt-get install
sudo apt-get install burg burg-common burg-emu burg-pc burg-themes burg-themes-common
Then (supposing that you wannt to install burg into MBR relative to hard disk named sda) execute:
sudo burg-install /dev/sda && sudo update-burg
Now you can use burg-manager to install new themes and to configure it.
Burg-manager current version is setted to install burg from Bean repository, but it’snt available for Natty, so command “sudo add–apt–repository ppa:bean123ch/burg” obviously fails.
This problem will be fixed with next burg-manager version.