diff -Nru di-netboot-assistant-0.58/debian/changelog di-netboot-assistant-0.59/debian/changelog
--- di-netboot-assistant-0.58/debian/changelog	2018-11-11 10:02:27.000000000 +0000
+++ di-netboot-assistant-0.59/debian/changelog	2018-12-15 15:31:15.000000000 +0000
@@ -1,3 +1,10 @@
+di-netboot-assistant (0.59) unstable; urgency=medium
+
+  * Allow old and recent installer archives:  Automatically detect
+    installer archive structure.
+
+ -- Andreas B. Mundt <andi@debian.org>  Sat, 15 Dec 2018 18:31:15 +0300
+
 di-netboot-assistant (0.58) unstable; urgency=medium
 
   * Signature check:  Allow for signatures with missing public keys if
diff -Nru di-netboot-assistant-0.58/di-netboot-assistant di-netboot-assistant-0.59/di-netboot-assistant
--- di-netboot-assistant-0.58/di-netboot-assistant	2018-11-11 10:02:27.000000000 +0000
+++ di-netboot-assistant-0.59/di-netboot-assistant	2018-12-15 15:31:15.000000000 +0000
@@ -1028,11 +1028,11 @@
     fi
     :
     tar_opts="$dl_file --directory $expand_dir --no-same-permissions"
-    ## archives are slightly different depending on arch:
-    if [ "$arch" = "armhf" ] ; then
-        nstrp=2
-    else
+    ## Some older archives have no leading './' directory (arch dependent):
+    if tar --list -f "$dl_file" | grep -q "^./" ; then
         nstrp=3
+    else
+        nstrp=2
     fi
     case "$(echo "$dl_file" | sed -e 's#^.*/##' )" in
 	*.tar.gz)