diff --git a/subiquity/models/locale.py b/subiquity/models/locale.py
index cfa60af6..01afbf05 100644
--- a/subiquity/models/locale.py
+++ b/subiquity/models/locale.py
@@ -15,6 +15,8 @@
 
 import logging
 
+from subiquitycore.utils import split_cmd_output
+
 log = logging.getLogger('subiquity.models.locale')
 
 
@@ -27,6 +29,9 @@ class LocaleModel:
     selected_language = None
     locale_support = "locale-only"
 
+    def __init__(self, chroot_prefix):
+        self.chroot_prefix = chroot_prefix
+
     def switch_language(self, code):
         self.selected_language = code
 
@@ -42,3 +47,15 @@ class LocaleModel:
         if '.' not in locale and '_' in locale:
             locale += '.UTF-8'
         return {'locale': locale}
+
+    async def target_packages(self):
+        if self.selected_language is None:
+            return []
+        if self.locale_support != "langpack":
+            return []
+        lang = self.selected_language.split('.')[0]
+        if lang == "C":
+            return []
+
+        return await split_cmd_output(
+            self.chroot_prefix + ['check-language-support', '-l', lang], None)
diff --git a/subiquity/models/subiquity.py b/subiquity/models/subiquity.py
index 975ba634..98e89689 100644
--- a/subiquity/models/subiquity.py
+++ b/subiquity/models/subiquity.py
@@ -116,7 +116,7 @@ class SubiquityModel:
         self.identity = IdentityModel()
         self.kernel = KernelModel()
         self.keyboard = KeyboardModel(self.root)
-        self.locale = LocaleModel()
+        self.locale = LocaleModel(self.chroot_prefix)
         self.mirror = MirrorModel()
         self.network = NetworkModel()
         self.packages = []
diff --git a/subiquity/server/controllers/locale.py b/subiquity/server/controllers/locale.py
index eb30df5e..064d0888 100644
--- a/subiquity/server/controllers/locale.py
+++ b/subiquity/server/controllers/locale.py
@@ -60,4 +60,4 @@ class LocaleController(SubiquityController):
 
     async def POST(self, data: str):
         self.model.switch_language(data)
-        self.configured()
+        await self.configured()
diff --git a/subiquitycore/utils.py b/subiquitycore/utils.py
index aacc80fd..34b5e9c4 100644
--- a/subiquitycore/utils.py
+++ b/subiquitycore/utils.py
@@ -97,6 +97,11 @@ async def astart_command(cmd, *, stdout=subprocess.PIPE,
         env=_clean_env(env), **kw)
 
 
+async def split_cmd_output(cmd, split_on):
+    cp = await arun_command(cmd, check=True)
+    return cp.stdout.split(split_on)
+
+
 def start_command(cmd, *, stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,
                   stderr=subprocess.PIPE, encoding='utf-8', errors='replace',
                   env=None, **kw):
diff --git a/system_setup/models/system_setup.py b/system_setup/models/system_setup.py
index b22df4ab..7c23d775 100644
--- a/system_setup/models/system_setup.py
+++ b/system_setup/models/system_setup.py
@@ -52,10 +52,11 @@ class SystemSetupModel(SubiquityModel):
         self.root = root
         if root != '/':
             self.target = root
+            self.chroot_prefix = []
 
         self.packages = []
         self.userdata = {}
-        self.locale = LocaleModel()
+        self.locale = LocaleModel(self.chroot_prefix)
         self.identity = IdentityModel()
         self.wslconfbase = WSLConfigurationBaseModel()
         self.wslconfadvanced = WSLConfigurationAdvancedModel()