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Spring can be installed on Ubuntu 9.10, 9.04, and 8.10.
Super easy Ubuntu 9.10 Installation Instructions
Ubuntu 9.10: Go to Applications->Ubuntu Software Center, search for springlobby, and click go.
Installation on Ubuntu 9.04 and 8.10
We now have a maintained and up to date APT repository for Ubuntu 9.04 (Jaunty) and 8.10 (Intrepid). If you have some older version of ubuntu, you can easily upgrade with these instructions: http://www.ubuntu.com/getubuntu/upgrading.
You'll need to add the Spring PPA below and install the springlobby package. Or you can upgrade to Ubuntu 9.10 and just install the springlobby package from the new Software Center.
Installing the repository key
First, we need to add the Launchpad PPA package-signing key; this allows Ubuntu to know the packages have been provided by the right people can can be trusted to be installed. If you skip this step then Ubuntu will complain about an unverifiable package every time there's an update for Spring.
Go to: http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0xFC66403D8670A035
Cut and paste the page contents to a file called "ppa-spring.pgp" or something recognizable like that. Do not use 'Save As' in your browser as this will likely not work because of added HTML formatting. You can use Applications->Accessories->Text Editor to cut-n-paste into and save to disk.
Security-conscious people can go to the Spring Developers PPA page on launchpad.net at https://launchpad.net/~spring/+archive/ppa to verify that the key mentioned above is indeed the right one to trust.
Now go to System -> Administration -> Software Sources and click on the 'Authentication' tab to add the saved 'ppa-spring.pgp' with the 'Import Key File' button. The new key should now pop up in the list.
Installing the repository
In System-> Administration -> Software Soruces, click on the Third-Party Software tab. Then, click the Add button, and paste one of the two lines corresponding to your Ubuntu release (9.04 or 8.10).
Ubuntu 9.04 "Jaunty Jackalope":
deb http://ppa.launchpad.net/spring/ubuntu jaunty main
Ubuntu 8.10 "Intrepid Ibex": Note: Please note if out of date. (It's easy enough to try.)
deb http://ppa.launchpad.net/spring/ubuntu intrepid main
Close the dialog, and click Reload when it asks.
After that's done, you can just CLICK HERE TO INSTALL EVERYTHING. Alternatively, you can head to System -> Administration -> Synaptic Package Manager, and search for spring. For the bare essentials, you'll need to install the spring-engine and springlobby packages.
Springlobby can be found in Applications -> Games. (Please note that you also need mods and maps to play. The easiest way to get them is to download them from Springlobby itself.
Alternative installation using the terminal
Press alt-F2 to run a command. Enter:
gksudo -- wget -O - "http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0xFC66403D8670A035" | apt-key add -
This will add the Spring-Developers PPA package-signing key to the list of keys that Ubuntu should trust for software packages. (See above for more info).
Then do:
gksudo gedit /etc/apt/sources.list.d/springproject.list
Copy and paste the following into the file:
Ubuntu 9.04:
deb http://ppa.launchpad.net/spring/ubuntu jaunty main
deb-src http://ppa.launchpad.net/spring/ubuntu jaunty main
Ubuntu 8.10:
deb http://ppa.launchpad.net/spring/ubuntu intrepid main
deb-src http://ppa.launchpad.net/spring/ubuntu intrepid main
Save the file. You can then either use the graphical package manager Synaptic (System->Administration->Synaptic Package Manager) and search for spring related packages, or just install spring from a terminal using:
sudo apt-get update
sudo apt-get install spring spring-maps-default
Other information
You can view the webpage for the repository here. Other packages (such as one for Kernel Panic) are there as well.
You can note that the package installs the Spring executable at /usr/games/spring and read-only data in /usr/share/games/spring.

