diff -Nru shadow-4.8.1/debian/changelog shadow-4.8.1/debian/changelog
--- shadow-4.8.1/debian/changelog	2021-01-06 23:05:37.000000000 -0600
+++ shadow-4.8.1/debian/changelog	2021-06-16 13:53:50.000000000 -0500
@@ -1,3 +1,9 @@
+shadow (1:4.8.1-1ubuntu9) impish; urgency=medium
+
+  * Disallow usernames in which the first character is numeric (LP: #1927078)
+
+ -- William 'jawn-smith' Wilson <william.wilson@canonical.com>  Wed, 16 Jun 2021 13:53:50 -0500
+
 shadow (1:4.8.1-1ubuntu8) hirsute; urgency=medium
 
   * Enable private home directories by default (LP: #48734)
diff -Nru shadow-4.8.1/debian/patches/506_relaxed_usernames shadow-4.8.1/debian/patches/506_relaxed_usernames
--- shadow-4.8.1/debian/patches/506_relaxed_usernames	2020-02-07 09:32:06.000000000 -0600
+++ shadow-4.8.1/debian/patches/506_relaxed_usernames	2021-06-16 13:53:50.000000000 -0500
@@ -25,7 +25,7 @@
  	/*
  	 * User/group names must match [a-z_][a-z0-9_-]*[$]
  	 */
-@@ -73,6 +74,26 @@
+@@ -73,6 +74,27 @@
  			return false;
  		}
  	}
@@ -40,7 +40,8 @@
 +	if (   ('\0' == *name)
 +	    || ('-'  == *name)
 +	    || ('~'  == *name)
-+	    || ('+'  == *name)) {
++	    || ('+'  == *name)
++	    || ('1' <= *name && '9' >= *name)) {
 +		return false;
 +	}
 +	do {
diff -Nru shadow-4.8.1/debian/tests/control shadow-4.8.1/debian/tests/control
--- shadow-4.8.1/debian/tests/control	2020-03-09 04:33:50.000000000 -0500
+++ shadow-4.8.1/debian/tests/control	2021-06-16 13:52:28.000000000 -0500
@@ -1,2 +1,2 @@
-Tests: smoke
+Tests: smoke, numeric-username
 Restrictions: needs-root, allow-stderr
diff -Nru shadow-4.8.1/debian/tests/numeric-username shadow-4.8.1/debian/tests/numeric-username
--- shadow-4.8.1/debian/tests/numeric-username	1969-12-31 18:00:00.000000000 -0600
+++ shadow-4.8.1/debian/tests/numeric-username	2021-06-16 13:53:50.000000000 -0500
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -ux
+
+useradd 123
+ret=$?
+if [ $ret -eq 0 ]
+then
+	exit 1
+fi