Public bug reported:

Binary package hint: initramfs-tools

Loopfiles inside of vfat cannot be remounted rw. This preventfs people
from booting off loopinstallations in vfat. At the moment there is an
exception in scripts/local to mount ntfs filesystems rw by default since
those too cannot be remounted (bug #186117). It might be necessary to
extend the treatment to all loopinstalation filesystems. Following are
some of my experiments, not sure if there is some other way to be able
to remount the host/loopfile.

[EMAIL PROTECTED] -t vfat -o rw /dev/sda8 /mnt
[EMAIL PROTECTED] -o loop,ro /mnt/root.disk /media/tmp 
[EMAIL PROTECTED] -o remount,rw /media/tmp
mount: block device /mnt/root.disk is write-protected, mounting read-only
[EMAIL PROTECTED] /media/tmp
[EMAIL PROTECTED] -o loop,rw /mnt/root.disk /media/tmp
[EMAIL PROTECTED] -o remount,ro /media/tmp           
[EMAIL PROTECTED] -o remount,rw /media/tmp
[EMAIL PROTECTED] -o remount,ro /mnt      
mount: /mnt is busy
[EMAIL PROTECTED] -o remount,ro /media/tmp
[EMAIL PROTECTED] -o remount,ro /mnt      
mount: /mnt is busy
[EMAIL PROTECTED] /media/tmp
[EMAIL PROTECTED] -d /mnt
[EMAIL PROTECTED] -t vfat -o ro /dev/sda8 /mnt
[EMAIL PROTECTED] -o loop,rw /mnt/root.disk /media/tmp
[EMAIL PROTECTED] -o remount,rw /media/tmp
mount: block device /mnt/root.disk is write-protected, mounting read-only
[EMAIL PROTECTED] /media/tmp 
[EMAIL PROTECTED] /dev/loop3 /mnt/root.disk 
[EMAIL PROTECTED] -o ro -t ext3 /dev/loop3 /media/tmp
[EMAIL PROTECTED] -o remount,rw /media/tmp           
mount: block device /dev/loop3 is write-protected, mounting read-only

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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Cannot remount loopfiles inside of vfat
https://bugs.launchpad.net/bugs/201750
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