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I've not seen this issue before, but can I suggest you enable serial logging of your Ubuntu VM? Make sure your kernel boot line has console=ttyS0 and set up Xen to log the serial consoles - see

I think that re-mounting during boot is perfectly normal as Linux mounts as read-only first, then mounts to read-write during the boot process.

One possibility is that Ubuntu may be referring to the root partition as 'sda', whereas in Xen it may show up as sda without paravirtualised drivers of xvda with them. The best way to refer to a disk is by it's UUID