diff --git a/system_setup/ui/views/identity.py b/system_setup/ui/views/identity.py
index cb883c12..484a1ebf 100644
--- a/system_setup/ui/views/identity.py
+++ b/system_setup/ui/views/identity.py
@@ -13,42 +13,84 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import os
+import re
+from subiquity.common.resources import resource_path
 from urwid import (
     connect_signal,
     )
 
 
 from subiquity.common.types import IdentityData
-from subiquity.ui.views.identity import IdentityForm, IdentityView, setup_password_validation
+from subiquity.ui.views.identity import IdentityForm, IdentityView, PasswordField, RealnameField, UsernameField, setup_password_validation
 from subiquitycore.ui.form import Form
 from subiquitycore.ui.utils import screen
 from subiquitycore.utils import crypt_password
 from subiquitycore.view import BaseView
 
+HOSTNAME_MAXLEN = 64
+HOSTNAME_REGEX = r'[a-z0-9_][a-z0-9_-]*'
+REALNAME_MAXLEN = 160
+SSH_IMPORT_MAXLEN = 256 + 3  # account for lp: or gh:
+USERNAME_MAXLEN = 32
+USERNAME_REGEX = r'[a-z_][a-z0-9_-]*'
 
 class WSLIdentityForm(Form):
 
-    realname = IdentityForm.realname
-    username = IdentityForm.username
-    username.help = _("The username does not need to match your Windows username")
-    password = IdentityForm.password
-    confirm_password = IdentityForm.confirm_password
-
-    def __init__(self, initial):
-        self.identityForm = IdentityForm([], initial)
+    def __init__(self, reserved_usernames, initial):
+        self.reserved_usernames = reserved_usernames
         super().__init__(initial=initial)
 
+    realname = RealnameField(_("Your name:"))
+    username = UsernameField(_("Pick a username:"), help=_("The username does not need to match your Windows username"))
+    password = PasswordField(_("Choose a password:"))
+    confirm_password = PasswordField(_("Confirm your password:"))
+
     def validate_realname(self):
-        self.identityForm.validate_realname()
+        if len(self.realname.value) > REALNAME_MAXLEN:
+            return _(
+                "Name too long, must be less than {limit}"
+                ).format(limit=REALNAME_MAXLEN)
+
+    def validate_hostname(self):
+        if len(self.hostname.value) < 1:
+            return _("Server name must not be empty")
+
+        if len(self.hostname.value) > HOSTNAME_MAXLEN:
+            return _(
+                "Server name too long, must be less than {limit}"
+                ).format(limit=HOSTNAME_MAXLEN)
+
+        if not re.match(HOSTNAME_REGEX, self.hostname.value):
+            return _(
+                "Hostname must match HOSTNAME_REGEX: " + HOSTNAME_REGEX)
 
     def validate_username(self):
-        self.identityForm.validate_username()
+        username = self.username.value
+        if len(username) < 1:
+            return _("Username missing")
+
+        if len(username) > USERNAME_MAXLEN:
+            return _(
+                "Username too long, must be less than {limit}"
+                ).format(limit=USERNAME_MAXLEN)
+
+        if not re.match(r'[a-z_][a-z0-9_-]*', username):
+            return _(
+                "Username must match USERNAME_REGEX: " + USERNAME_REGEX)
+
+        if username in self.reserved_usernames:
+            return _(
+                'The username "{username}" is reserved for use by the system.'
+                ).format(username=username)
 
     def validate_password(self):
-        self.identityForm.validate_password()
+        if len(self.password.value) < 1:
+            return _("Password must be set")
 
     def validate_confirm_password(self):
-        self.identityForm.validate_confirm_password()
+        if self.password.value != self.confirm_password.value:
+            return _("Passwords do not match")
 
 
 class WSLIdentityView(BaseView):
@@ -59,12 +101,24 @@ class WSLIdentityView(BaseView):
     def __init__(self, controller, identity_data):
         self.controller = controller
 
+        reserved_usernames_path = resource_path('reserved-usernames')
+        reserved_usernames = set()
+        if os.path.exists(reserved_usernames_path):
+            with open(reserved_usernames_path) as fp:
+                for line in fp:
+                    line = line.strip()
+                    if line.startswith('#') or not line:
+                        continue
+                    reserved_usernames.add(line)
+        else:
+            reserved_usernames.add('root')
+
         initial = {
             'realname': identity_data.realname,
             'username': identity_data.username,
             }
 
-        self.form = WSLIdentityForm(initial)
+        self.form = WSLIdentityForm(reserved_usernames, initial)
 
         connect_signal(self.form, 'submit', self.done)
         setup_password_validation(self.form, _("passwords"))