install only the ubuntu keyring

debian/rules

@@ -209,7 +209,7 @@ apt: build debian/shlibs.local
 
 	cp debian/bugscript debian/$@/usr/share/bug/apt/script
 
-	cp share/debian-archive.gpg debian/$@/usr/share/$@
+	cp share/ubuntu-archive.gpg debian/$@/usr/share/$@
 
 #	head -n 500 ChangeLog > debian/ChangeLog