diff '--color=auto' -rupN adduser-debian-3.131.orig/AdduserCommon.pm adduser-debian-3.131/AdduserCommon.pm
--- adduser-debian-3.131.orig/AdduserCommon.pm	2023-03-07 18:08:25.694341050 +1030
+++ adduser-debian-3.131/AdduserCommon.pm	2023-03-07 18:11:00.172778792 +1030
@@ -286,18 +286,18 @@ sub preseed_config {
         backup => 0,
         backup_to => ".",
         dshell => "/bin/bash",
-        first_system_uid => 100,
+        first_system_uid => 500,
         last_system_uid => 999,
         first_uid => 1000,
-        last_uid => 59999,
-        first_system_gid => 100,
+        last_uid => 60000,
+        first_system_gid => 500,
         last_system_gid => 999,
         first_gid => 1000,
-        last_gid => 59999,
+        last_gid => 60000,
         dhome => "/home",
         skel => "/etc/skel",
         usergroups => "yes",
-        users_gid => undef,
+        users_gid => -1,
         users_group => undef,
         grouphomes => "no",
         letterhomes => "no",
@@ -306,8 +306,8 @@ sub preseed_config {
         sys_dir_mode => "0755",
         setgid_home => "no",
         no_del_paths => "^/bin\$ ^/boot\$ ^/dev\$ ^/etc\$ ^/initrd ^/lib ^/lost+found\$ ^/media\$ ^/mnt\$ ^/opt\$ ^/proc\$ ^/root\$ ^/run\$ ^/sbin\$ ^/srv\$ ^/sys\$ ^/tmp\$ ^/usr\$ ^/var\$ ^/vmlinu",
-        name_regex => "^[a-z][a-z0-9_-]*\\\$?\$",
-        sys_name_regex => "^[a-z_][a-z0-9_-]*\\\$?\$",
+        name_regex => "^[a-zA-Z0-9_][a-zA-Z0-9_-]*\\\$?\$",
+        sys_name_regex => "^[a-zA-Z0-9_][a-zA-Z0-9_-]*\\\$?\$",
         exclude_fstypes => "(proc|sysfs|usbfs|devpts|devtmpfs|devfs|afs)",
         skel_ignore_regex => "\.(dpkg|ucf)-(old|new|dist)\$",
         extra_groups => "users",
diff '--color=auto' -rupN adduser-debian-3.131.orig/adduser.conf adduser-debian-3.131/adduser.conf
--- adduser-debian-3.131.orig/adduser.conf	2023-03-07 18:08:25.694341050 +1030
+++ adduser-debian-3.131/adduser.conf	2023-03-07 18:12:36.269287490 +1030
@@ -21,21 +21,21 @@
 # Specify inclusive ranges of UIDs and GIDs from which UIDs and GIDs
 # for system users, system groups, non-system users and non-system groups
 # can be dynamically allocated.
-# Default: FIRST_SYSTEM_UID=100, LAST_SYSTEM_UID=999
-#FIRST_SYSTEM_UID=100
+# Default: FIRST_SYSTEM_UID=500, LAST_SYSTEM_UID=999
+#FIRST_SYSTEM_UID=500
 #LAST_SYSTEM_UID=999
 
-# Default: FIRST_SYSTEM_GID=100, LAST_SYSTEM_GID=999
-#FIRST_SYSTEM_GID=100
+# Default: FIRST_SYSTEM_GID=500, LAST_SYSTEM_GID=999
+#FIRST_SYSTEM_GID=500
 #LAST_SYSTEM_GID=999
 
-# Default: FIRST_UID=1000, LAST_UID=59999
+# Default: FIRST_UID=1000, LAST_UID=60000
 #FIRST_UID=1000
-#LAST_UID=59999
+#LAST_UID=60000
 
-# Default: FIRST_GID=1000, LAST_GID=59999
+# Default: FIRST_GID=1000, LAST_GID=60000
 #FIRST_GID=1000
-#LAST_GID=59999
+#LAST_GID=60000
 
 # Specify a file or a directory containing UID and GID pool.
 #UID_POOL=/etc/adduser-pool.conf
@@ -52,7 +52,8 @@
 # non-system users are placed into.
 # It is a configuration error to define both variables
 # even if the values are consistent.
-# Default: USERS_GID=undefined, USERS_GROUP=users
+# Set USERS_GID=-1 to disable this functionality.
+# Default: USERS_GID=-1, USERS_GROUP is undefined
 #USERS_GID=100
 #USERS_GROUP=users
 
@@ -71,13 +72,13 @@
 
 # Non-system user- and groupnames are checked against this regular
 # expression.
-# Default: NAME_REGEX="^[a-z][-a-z0-9_]*\$?$"
-#NAME_REGEX="^[a-z][-a-z0-9_]*\$?$"
+# Default: NAME_REGEX="^[a-zA-Z0-9_][-a-zA-Z0-9_]*\$?$"
+#NAME_REGEX="^[a-zA-Z0-9][-a-zA-Z0-9_]*\$?$"
 
 # System user- and groupnames are checked against this regular
 # expression.
-# Default: SYS_NAME_REGEX="^[a-z_][-a-z0-9_]*\$?$"
-#SYS_NAME_REGEX="^[a-z_][-a-z0-9_]*\$?$"
+# Default: SYS_NAME_REGEX="^[a-zA-Z0-9_][-a-zA-Z0-9_]*\$?$"
+#SYS_NAME_REGEX="^[a-zA-Z0-9_][-a-zA-Z0-9_]*\$?$"
 
 # When populating the newly created home directory of a non-system user,
 # files in SKEL matching this regex are not copied.
diff '--color=auto' -rupN adduser-debian-3.131.orig/doc/adduser.conf.5 adduser-debian-3.131/doc/adduser.conf.5
--- adduser-debian-3.131.orig/doc/adduser.conf.5	2023-03-07 18:08:25.697674494 +1030
+++ adduser-debian-3.131/doc/adduser.conf.5	2023-03-07 18:10:36.715337017 +1030
@@ -62,17 +62,17 @@ Defaults to \fIusers\fP.
 .B FIRST_SYSTEM_GID " and " LAST_SYSTEM_GID
 specify an inclusive range of GIDs from which GIDs
 for system groups can be dynamically allocated.
-Defaults to \fI100\fP - \fI999\fP.
+Defaults to \fI500\fP - \fI999\fP.
 .TP
 .B FIRST_GID " and " LAST_GID
 specify an inclusive range of GIDs from which GIDs
 for non-system groups can be dynamically allocated.
-Defaults to \fI1000\fP - \fI59999\fP.
+Defaults to \fI1000\fP - \fI60000\fP.
 .TP
 .B FIRST_SYSTEM_UID " and " LAST_SYSTEM_UID
 specify an inclusive range of UIDs from which UIDs
 for system users can be dynamically allocated.
-Defaults to \fI100\fP - \fI999\fP.
+Defaults to \fI500\fP - \fI999\fP.
 Please note that system software,
 such as the users allocated by the \fIbase-passwd\fP package,
 may assume that UIDs less than 100 are unallocated.
@@ -80,7 +80,7 @@ may assume that UIDs less than 100 are u
 .B FIRST_UID " and " LAST_UID
 specify an inclusive range of UIDs from which UIDs
 for non-system users can be dynamically allocated.
-Defaults to \fI1000\fP - \fI59999\fP.
+Defaults to \fI1000\fP - \fI60000\fP.
 .TP
 .B GID_POOL
 See \fBUID_POOL\fP.
@@ -113,7 +113,7 @@ user and group creation in \fBadduser\fR
 unless \-\-allow\-bad\-names is set.
 With \-\-allow\-bad\-names set,
 weaker checks are performed.
-Defaults to the most conservative \fI^[a\-z][\-a\-z0\-9_]*$\fP.
+Defaults to the Arch policy \fI^[a\-zA\-Z0\-9_][\-a\-zA\-Z0\-9_]*\\$?$\fP.
 See \fBSYS_NAME_REGXEX\fP and \fBValid names\fP,
 below, for more information.
 .TP
@@ -161,7 +161,7 @@ system user and group creation in adduse
 unless \-\-allow\-bad\-names is set.
 With \-\-allow\-bad\-names set,
 weaker checks are performed.
-Defaults to the most conservative \fI^[a\-z_][\-a\-z0\-9_]*$\fP.
+Defaults to the Arch policy \fI^[a\-zA\-Z0\-9_][\-a\-zA\-Z0\-9_]*\\$?$\fP.
 See \fBNAME_REGEX\fP, above, and \fBValid names\fP,
 below, for more information.
 .TP