You might be interested to know that there is an option in Hardy Heron to Install Ubuntu that will use ubiquity without launching a full desktop environment and it is usable with 256MB of RAM. While this isn't a solution to the bug you have brought up I thought you might find it useful.
You might be interested to know that there is an option in Hardy Heron to Install Ubuntu that will use ubiquity without launching a full desktop environment and it is usable with 256MB of RAM. While this isn't a solution to the bug you have brought up I thought you might find it useful.