You can follow the instrucctions here:
http://wiki.i-mscp.net/doku.php?id=migration:ispcp
But please, do it with a copy, because it's work in progress (I'd recommend to test with current trunk).
And IMPORTANT: You have to cancel the setup before installing i-mscp to be able to run the "perl imscp-migrate-from-ispcp" command, otherwise you might break lots of things.
Other than that, the process i quite save and most of the standard things will work (plus the benefits of migrating)
UPDATE Migrating from ubuntu to debian and from ispcp to i-mscp can be difficult even though the two linux flavours are quite similar. If I were you, I'd made the two processes separately.
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Yes, I've seen the migration wiki and read through the perl script a bit, but it is only for migrating from ispcp on the same machine. I am trying to migrate from a different machine over, so it fails, saying the directories don't exist, etc.
I was wondering if anyone has a workaround, or know how to modify in some variables or something into the script, so I can tell it to migrate from a remote machine, using a different IP and nsh or something. I can modify the rest to make it work coming from Ubuntu, and I will make that modified script available to everyone of course.