#edit that as appropriate for your system
LOOPBACK_DEVICE=/dev/loop0
test -w /
if [ $? != 0 ]; then
    echo 'You must run this script as root'
    exit 1
fi
umount $LOOPBACK_DEVICE
# losetup -d $LOOPBACK_DEVICE
rm -f $LOOPBACK_DEVICE
rm -rf $RX71TMP
# mknod $LOOPBACK_DEVICE b 7 99
if [ $? != 0 ]; then
    echo 'Unable to create loopback device '$LOOPBACK_DEVICE
    exit 1
fi

[1|root@Nokia-N900|~/n900_720p]./mount_n950_rootfs.sh
umount: cannot umount /tmp/n950loop: Invalid argument
losetup: /tmp/n950loop: No such device or address
Reading package lists... Done
Building dependency tree       
Reading state information... Done
wget is already the newest version.
liblzo2-2 is already the newest version.
p7zip-full is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
/usr/bin/7z: exec: line 2: /usr/lib/p7zip/7z: Too many levels of symbolic links
7z archiver not found.
On n900 it is a part of p7zip-full package
You may try to install it with "sudo apt-get install p7zip-full"
[1|root@Nokia-N900|~/n900_720p]