I've uploaded base-files_5lenny2 for stable, which includes the
/etc/debian_version change in base-files_5lenny1 by the release team,
plus a bug fix I think it should be fixed in lenny, namely Bug#519719.
This is the diff:
--- base-files-5lenny1/debian/remove-base 2002-02-08 16:39:13.000000000 +0100
+++ base-files-5lenny2/debian/remove-base 2009-04-11 14:31:10.000000000 +0200
@@ -1,6 +1,6 @@
-rm -f /var/lib/dpkg/base.*
+rm -f /var/lib/dpkg/info/base.*
if grep -q "^Package: base$" status; then
cp status status.bak
Please include base-files_5lenny2 in Debian 5.0.1, if possible.