diff --git a/src/yunohost/data_migrations/0021_migrate_to_bullseye.py b/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
index d26eede88..153081916 100644
--- a/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
+++ b/src/yunohost/data_migrations/0021_migrate_to_bullseye.py
@@ -7,7 +7,7 @@ from moulinette.utils.log import getActionLogger
 from moulinette.utils.process import check_output, call_async_output
 from moulinette.utils.filesystem import read_file, rm
 
-from yunohost.tools import Migration, tools_update, tools_upgrade
+from yunohost.tools import Migration, tools_update, tools_upgrade, _apt_log_line_is_relevant
 from yunohost.app import unstable_apps
 from yunohost.regenconf import manually_modified_files, _force_clear_hashes
 from yunohost.utils.filesystem import free_space_in_directory
@@ -77,9 +77,12 @@ class MyMigration(Migration):
         _force_clear_hashes(["/etc/mysql/my.cnf"])
         rm("/etc/mysql/mariadb.cnf", force=True)
         rm("/etc/mysql/my.cnf", force=True)
-        self.apt_install(
+        ret = self.apt_install(
             "mariadb-common --reinstall -o Dpkg::Options::='--force-confmiss'"
         )
+        if ret != 0:
+            # FIXME: i18n once this is stable?
+            raise YunohostError("Failed to reinstall mariadb-common ?", raw_msg=True)
 
         #
         # /usr/share/yunohost/yunohost-config/ssl/yunoCA -> /usr/share/yunohost/ssl
@@ -196,9 +199,12 @@ class MyMigration(Migration):
             f.strip() for f in check_output(cmd).split("\n") if f.strip()
         ]
 
-        self.apt_install(
+        ret = self.apt_install(
             f"{' '.join(php74packages_to_install)} -o Dpkg::Options::='--force-confmiss'"
         )
+        if ret != 0:
+            # FIXME: i18n once this is stable?
+            raise YunohostError("Failed to force the install of php dependencies ?", raw_msg=True)
 
         # Clean the mess
         logger.info(m18n.n("migration_0021_cleaning_up"))
@@ -209,7 +215,21 @@ class MyMigration(Migration):
         # Yunohost upgrade
         #
         logger.info(m18n.n("migration_0021_yunohost_upgrade"))
+
         self.unhold(apps_packages)
+
+        cmd = "LC_ALL=C"
+        cmd += " DEBIAN_FRONTEND=noninteractive"
+        cmd += " APT_LISTCHANGES_FRONTEND=none"
+        cmd += " apt dist-upgrade "
+        cmd += " --quiet -o=Dpkg::Use-Pty=0 --fix-broken --dry-run"
+        cmd += " | grep -q '-ynh-deps'"
+
+        logger.info("Simulating upgrade...")
+        if os.system(cmd) == 0:
+            # FIXME: i18n once this is stable?
+            raise YunohostError("The upgrade cannot be completed, because some app dependencies would need to be removed?", raw_msg=True)
+
         tools_upgrade(target="system")
 
     def debian_major_version(self):
@@ -344,9 +364,11 @@ class MyMigration(Migration):
 
         callbacks = (
             lambda l: logger.info("+ " + l.rstrip() + "\r")
-            if is_relevant(l)
+            if _apt_log_line_is_relevant(l)
             else logger.debug(l.rstrip() + "\r"),
-            lambda l: logger.warning(l.rstrip()),
+            lambda l: logger.warning(l.rstrip())
+            if _apt_log_line_is_relevant(l)
+            else logger.debug(l.rstrip()),
         )
 
         cmd = (
@@ -356,7 +378,7 @@ class MyMigration(Migration):
 
         logger.debug("Running: %s" % cmd)
 
-        call_async_output(cmd, callbacks, shell=True)
+        return call_async_output(cmd, callbacks, shell=True)
 
     def patch_yunohost_conflicts(self):
         #
diff --git a/src/yunohost/tools.py b/src/yunohost/tools.py
index c825ca2ef..021a8f3a1 100644
--- a/src/yunohost/tools.py
+++ b/src/yunohost/tools.py
@@ -567,29 +567,12 @@ def tools_upgrade(
 
             logger.debug("Running apt command :\n{}".format(dist_upgrade))
 
-            def is_relevant(line):
-                irrelevants = [
-                    "service sudo-ldap already provided",
-                    "Reading database ...",
-                    "Preparing to unpack",
-                    "Selecting previously unselected package",
-                    "Created symlink /etc/systemd",
-                    "Replacing config file",
-                    "Creating config file",
-                    "Installing new version of config file",
-                    "Installing new config file as you requested",
-                    ", does not exist on system.",
-                    "unable to delete old directory",
-                    "update-alternatives:",
-                ]
-                return line.rstrip() and all(i not in line.rstrip() for i in irrelevants)
-
             callbacks = (
                 lambda l: logger.info("+ " + l.rstrip() + "\r")
-                if is_relevant(l)
+                if _apt_log_line_is_relevant(l)
                 else logger.debug(l.rstrip() + "\r"),
                 lambda l: logger.warning(l.rstrip())
-                if is_relevant(l)
+                if _apt_log_line_is_relevant(l)
                 else logger.debug(l.rstrip()),
             )
             returncode = call_async_output(dist_upgrade, callbacks, shell=True)
@@ -689,6 +672,24 @@ def tools_upgrade(
             operation_logger.success()
 
 
+def _apt_log_line_is_relevant(line):
+    irrelevants = [
+        "service sudo-ldap already provided",
+        "Reading database ...",
+        "Preparing to unpack",
+        "Selecting previously unselected package",
+        "Created symlink /etc/systemd",
+        "Replacing config file",
+        "Creating config file",
+        "Installing new version of config file",
+        "Installing new config file as you requested",
+        ", does not exist on system.",
+        "unable to delete old directory",
+        "update-alternatives:",
+    ]
+    return line.rstrip() and all(i not in line.rstrip() for i in irrelevants)
+
+
 @is_unit_operation()
 def tools_shutdown(operation_logger, force=False):
     shutdown = force