Linux Articles listed under "Fixing the Casper script"
Along with the final release of Ubuntu 8.04 came a bug which broke the persistence feature, ultimately dropping the user to a shell when booting with the persistent option. As it turns out, the problem lies with permissions being set to 755 for the cow device (strangely enough the prereleases did not have this problem). In the following tutorial, I will show you how to quickly fix the problem. This is the same process we used to create the custom initrd.gz file that is distributed with our Ubuntu, Kubuntu and Xubuntu 8.04 Hardy Heron related USB flash drive installation tutorials.