Have attached above a couple of files to test.

The first one is a new initramfs with sync mount options (replace
/usr/share/initramfs-tools/scripts/local and rebuild the initrd). The
sync options are for the host filesystem as opposed to the nested one
(see above comment).

The other file is /etc/init.d/umountroot. I tested it, but it does not
seem to manage to remount /host (ntfs-3g) ro. I get the error
"Remounting is not supported at present" (see bug #186117).  One way to
test is to disable /etc/init.d/reboot and then run sudo reboot.

You may want to change sysctl settings manually to emulate a wubi
environment:

sysctl -w vm.dirty_background_ratio=0
sysctl -w vm.dirty_ratio=40
sysctl -w vm.dirty_expire_centisecs=2
sysctl -w vm.dirty_writeback_centisecs=2

-- 
wubi install unusable - Buffer I/O error on device loop0
https://bugs.launchpad.net/bugs/204133
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