diff -u vsftpd-2.3.0~pre2/debian/vsftpd.postinst vsftpd-2.3.0~pre2/debian/vsftpd.postinst
--- vsftpd-2.3.0~pre2/debian/vsftpd.postinst
+++ vsftpd-2.3.0~pre2/debian/vsftpd.postinst
@@ -16,13 +16,13 @@
 
 		db_stop
 
-		if ! getent group | grep -q "^${_USERNAME}"
+		if ! getent group | grep -q "^${_USERNAME}:"
 		then
 			addgroup --system --quiet ${_USERNAME}
 		else
 			echo "vsftpd group (${_USERNAME}) already exists, doing nothing."
 		fi
-		if ! getent passwd | grep -q "^${_USERNAME}"
+		if ! getent passwd | grep -q "^${_USERNAME}:"
 		then
 			adduser --system --home ${_DIRECTORY} --no-create-home --quiet --gecos 'ftp daemon' --group ${_USERNAME}
 		else
diff -u vsftpd-2.3.0~pre2/debian/changelog vsftpd-2.3.0~pre2/debian/changelog
--- vsftpd-2.3.0~pre2/debian/changelog
+++ vsftpd-2.3.0~pre2/debian/changelog
@@ -1,3 +1,10 @@
+vsftpd (2.3.0~pre2-4ubuntu3) maverick; urgency=low
+
+  * debian/vsftpd.postinst: Use complete name match when checking for existing
+    ftp user/group, to avoid install failure (LP: #656415)
+
+ -- Serge Hallyn <serge.hallyn@ubuntu.com>  Wed, 22 Dec 2010 21:00:11 +0000
+
 vsftpd (2.3.0~pre2-4ubuntu2) maverick; urgency=low
 
   * debian/vsftpd.postinst: Check that the group exists first, then