diff -rupN unpacked_orig/DEBIAN/preinst unpacked/DEBIAN/preinst
--- unpacked_orig/DEBIAN/preinst	2015-05-06 23:43:18.000000000 +0300
+++ unpacked/DEBIAN/preinst	2015-05-22 03:06:38.268899408 +0300
@@ -91,7 +91,7 @@ case "$1" in
             echo "Moving ati dir to /etc for the fglrx-core transition"
             cp -RL /etc/ati /etc/ati.dpkg-bak 2>/dev/null || true
             # Remove the link
-            rm -f /etc/ati 2>/dev/null
+            rm -rf /etc/ati 2>/dev/null
             # Finally move ati into /etc
             mv /etc/ati.dpkg-bak /etc/ati 2>/dev/null || true