diff -Nru ubiquity-23.10.4/debian/changelog ubiquity-23.10.10/debian/changelog
--- ubiquity-23.10.4/debian/changelog	2023-09-15 20:16:45.000000000 +0200
+++ ubiquity-23.10.10/debian/changelog	2023-09-20 14:00:55.000000000 +0200
@@ -1,3 +1,9 @@
+ubiquity (23.10.10) mantic; urgency=medium
+
+  * Migrate to Libsoup 3.0 (LP: #1987454).
+
+ -- Nathan Pratta Teodosio <nathan.teodosio@canonical.com>  Wed, 20 Sep 2023 14:00:55 +0200
+
 ubiquity (23.10.4) mantic; urgency=medium
 
   * Depend: on grub-pc.  Currently, ubiquity depends on shim-signed, but
diff -Nru ubiquity-23.10.4/debian/control ubiquity-23.10.10/debian/control
--- ubiquity-23.10.4/debian/control	2023-09-15 20:15:32.000000000 +0200
+++ ubiquity-23.10.10/debian/control	2023-09-20 14:00:55.000000000 +0200
@@ -17,7 +17,7 @@
                dh-python,
                dpkg-dev (>= 1.16.1~),
                gir1.2-nma-1.0,
-               gir1.2-soup-2.4,
+               gir1.2-soup-3.0,
                gir1.2-timezonemap-1.0,
                gir1.2-webkit2-4.0,
                gir1.2-xkl-1.0,
@@ -135,7 +135,7 @@
          gir1.2-gtk-3.0 (>= 3.20),
          gir1.2-nma-1.0,
          gir1.2-pango-1.0,
-         gir1.2-soup-2.4,
+         gir1.2-soup-3.0,
          gir1.2-timezonemap-1.0,
          gir1.2-vte-2.91,
          gir1.2-webkit2-4.0,
diff -Nru ubiquity-23.10.4/d-i/update-control ubiquity-23.10.10/d-i/update-control
--- ubiquity-23.10.4/d-i/update-control	2023-08-14 00:11:42.000000000 +0200
+++ ubiquity-23.10.10/d-i/update-control	2023-09-20 14:00:55.000000000 +0200
@@ -39,7 +39,7 @@
     'dh-python',
     'dpkg-dev (>= 1.14.4)',
     'gir1.2-nma-1.0',
-    'gir1.2-soup-2.4',
+    'gir1.2-soup-3.0',
     'gir1.2-timezonemap-1.0',
     'gir1.2-webkit2-4.0',
     'intltool (>= 0.40.0)',
diff -Nru ubiquity-23.10.4/ubiquity/plugins/ubi-timezone.py ubiquity-23.10.10/ubiquity/plugins/ubi-timezone.py
--- ubiquity-23.10.4/ubiquity/plugins/ubi-timezone.py	2023-08-14 00:11:42.000000000 +0200
+++ ubiquity-23.10.10/ubiquity/plugins/ubi-timezone.py	2023-09-20 14:00:55.000000000 +0200
@@ -94,7 +94,7 @@
 
     def changed(self, entry):
         import gi
-        gi.require_version('Soup', '2.4')
+        gi.require_version('Soup', '3.0')
         from gi.repository import Gtk, GObject, GLib, Soup
 
         text = misc.utf8(self.city_entry.get_text())
@@ -111,18 +111,24 @@
                                   GObject.TYPE_STRING)
 
             if self.geoname_session is None:
-                self.geoname_session = Soup.SessionAsync()
+                self.geoname_session = Soup.Session()
             url = _geoname_url % (quote(text), misc.get_release().version)
             message = Soup.Message.new('GET', url)
-            message.request_headers.append('User-agent', 'Ubiquity/1.0')
+            headers = message.get_request_headers()
+            headers.replace('User-agent', 'Ubiquity/1.0')
             self.geoname_session.abort()
             if self.geoname_timeout_id is not None:
                 GLib.source_remove(self.geoname_timeout_id)
             self.geoname_timeout_id = \
                 GLib.timeout_add_seconds(2, self.geoname_timeout,
                                          (text, model))
-            self.geoname_session.queue_message(message, self.geoname_cb,
-                                               (text, model))
+            self.geoname_session.send_and_read_async(
+                message,
+                GLib.PRIORITY_DEFAULT,
+                None,
+                self.geoname_cb,
+                (text, model)
+            )
 
     def geoname_add_tzdb(self, text, model):
         if len(model):
@@ -153,10 +159,10 @@
         self.city_entry.get_completion().set_model(model)
         return False
 
-    def geoname_cb(self, session, message, user_data):
+    def geoname_cb(self, session, result, user_data):
         import syslog
         import json
-        from gi.repository import GLib, Soup
+        from gi.repository import GLib, Soup, Gio
 
         text, model = user_data
 
@@ -165,17 +171,31 @@
             self.geoname_timeout_id = None
         self.geoname_add_tzdb(text, model)
 
-        if message.status_code == Soup.KnownStatusCode.CANCELLED:
-            # Silently ignore cancellation.
+        cancelled = false
+        try:
+            response_body = session.send_and_read_finish(result)
+        except GLib.GError as e:
+            cancelled = e.code == Gio.IOErrorEnum.CANCELLED
+            if (not cancelled):
+                # Silently ignore cancellation, log but otherwise ignore other
+                # failures.
+                syslog.syslog(
+                    'Geoname lookup for "%s" failed: %s' % (text, e.message)
+                )
+
+        message = session.get_async_result_message(result)
+        if cancelled:
+            # Silently ignore cancellation, log but otherwise ignore other
+            # failures.
             pass
-        elif message.status_code != Soup.KnownStatusCode.OK:
+        elif message.get_status() != Soup.Status.OK:
             # Log but otherwise ignore failures.
             syslog.syslog(
                 'Geoname lookup for "%s" failed: %d %s' %
-                (text, message.status_code, message.reason_phrase))
+                (text, message.get_status(), message.get_reason_phrase()))
         else:
             try:
-                for result in json.loads(message.response_body.data):
+                for result in json.loads(response_body.decode()):
                     model.append([
                         result['name'], result['admin1'], result['country'],
                         result['latitude'], result['longitude']])