Originally Posted by fanoush

Now I got bitten by this too. Workaround is to edit file
/usr/sbin/osso-mmc-umount.sh (as already mentioned here http://www.internettablettalk.com/fo...&postcount=123 )
and change one line 'umount $mp 2> /dev/null' in this loop

Code:

        for mp in $MPS; do
          umount $mp 2> /dev/null
          RC=$?
          if [ $RC != 0 ]; then
            echo "$0: could not unmount $mp"
            exit $RC
          fi
        done

to be

Code:

        for mp in $MPS; do
          if [ "$mp" != "/" ] ; then umount $mp 2> /dev/null ; fi
          RC=$?
          if [ $RC != 0 ]; then
            echo "$0: could not unmount $mp"
            exit $RC
          fi
        done

Which means skip unmounting root filesystem. If you don't write to same filesystem (i.e the active linux partition) over usb, it is safe. Most probably you just want to write to first FAT partition anyway.