My slicehost slice was running Gutsy (Ubuntu 7.10), but when I switched my projects from my personal svn server to github, gutsy only had an early version of git that doesn't support
submodule ... the only way to upgrade git was to upgrade my ubuntu.
After a quick mysql backup, these are the instructions that worked:
sudo vi /etc/apt/sources.list # [ replace each "gutsy" with "hardy" ] sudo apt-get update sudo apt-get dist-upgrade
I found this solution on ubuntugeek.com. It worked first time, like a charm. Congratulations ubuntu team ... linux has come a long, long way