use apt-get instead of aptitude

aptitude segfault when using cross architecture. Also apt-get is much
faster. So, from now on use apt-get

lib/updatebase

@@ -32,11 +32,7 @@ $ROOTCMD apt-get $aptopt check
 [ $? -ne 0 ] && $ROOTCMD apt-get $aptopt -f install </dev/null
 $ROOTCMD dpkg -C
 [ $? -ne 0 ] && yes '' | $ROOTCMD dpkg --configure -a
-if [ -x $FAI_ROOT/usr/bin/aptitude ]; then
-    $ROOTCMD aptitude $aptopt -f -y full-upgrade </dev/null
-else
-    $ROOTCMD apt-get $aptopt dist-upgrade < /dev/null
-fi
+$ROOTCMD apt-get $aptopt dist-upgrade < /dev/null
 # update dpkg info which packages are available
 tmp=$($ROOTCMD mktemp) || exit 88
 $ROOTCMD apt-cache dumpavail > $FAI_ROOT/$tmp