diff --git a/src/usbinstall.sh b/src/usbinstall.sh
index 8e5446b..113c656 100755
--- a/src/usbinstall.sh
+++ b/src/usbinstall.sh
@@ -53,6 +53,14 @@ org.freedesktop.DBus.Properties.Get string:$3 string:$4`
    return 0
 }
 
+function dbus_properties_get_bool() {
+   REPLY=`dbus-send --system --print-reply --dest=$1 $2 org.freedesktop.DBus.Properties.Get string:$3 string:$4`
+   [ $? -eq 0 ] || return 1
+   echo $REPLY | sed "s|.*boolean \(.*\)|\1|"
+   return 0
+}
+
+
 # Set progressbar (only if $DBUS_USBINSTALL = 1)
 # Arg 1: value%
 set_pbar()
@@ -62,7 +70,7 @@ set_pbar()
 	fi
 }
 
-# Set status label
+# Set status label (only if $DBUS_USBINSTALL = 1)
 # Arg 1: string
 set_status()
 {
@@ -83,10 +91,16 @@ export SELECT_BOOT=$2
 export SELECT_ISO=$3
 
 set_status "Smonto la chiavetta"
-LANG=C udisks --unmount ${SELECT_USB}1 | grep failed && { 
+
+DEVICEISMOUNTED=`dbus_properties_get_bool org.freedesktop.UDisks /org/freedesktop/UDisks/devices/${SELECT_USB/*\/}1 \
+org.freedesktop.UDisks.Device DeviceIsMounted`
+
+if [ "$DEVICEISMOUNTED" = "true" ]; then
+   LANG=C udisks --unmount ${SELECT_USB}1 | grep failed && { 
 	echo "Error: fail to umount the usb key (${SELECT_USB}1)"
 	exit 1
-}
+   }
+fi
 set_pbar 2
 
 
@@ -95,7 +109,7 @@ sudo fdisk $SELECT_USB < ./fdisk_template
 set_pbar 5
 sudo mkfs.ext3 ${SELECT_USB}1 -L openmamba_live
 sleep 1
-udisks --mount ${SELECT_USB}1
+LANG=C udisks --mount ${SELECT_USB}1
 set_pbar 30
 
 
@@ -104,7 +118,7 @@ MOUNTDIR=`dbus_properties_get_stringlist org.freedesktop.UDisks /org/freedesktop
 org.freedesktop.UDisks.Device DeviceMountPaths`
 
 set_status "Estrazione del file di boot in corso..."
-pushd $MOUNTDIR
+pushd $MOUNTDIR >/dev/null
 sudo chmod 777 ./
 gunzip -c $SELECT_BOOT | cpio -i
 set_pbar 38
@@ -128,12 +142,12 @@ while [ $ORIG_SIZE -gt $DEST_SIZE ]; do
 	sleep 2
 done
 ln -fs `basename $SELECT_ISO` ./openmamba-live.iso
-popd
+popd >/dev/null
 set_pbar 98
 
 
 set_status "Smonto la chiavetta"
-udisks --unmount ${SELECT_USB}1 |  grep failed && { 
+LANG=C udisks --unmount ${SELECT_USB}1 |  grep failed && { 
 	echo "Error: fail to umount the usb key (${SELECT_USB}1)"
 	exit 2
 }