diff --git a/fuel_agent/tests/test_lvm_utils.py b/fuel_agent/tests/test_lvm_utils.py
index aeaba8f..a1150f6 100644
--- a/fuel_agent/tests/test_lvm_utils.py
+++ b/fuel_agent/tests/test_lvm_utils.py
@@ -308,10 +308,41 @@ class TestLvmUtils(unittest2.TestCase):
         mock_vgdisplay.return_value = [{'name': 'vgname', 'free': 2000},
                                        {'name': 'some'}]
         mock_lvdisplay.return_value = [{'name': 'some'}]
+        mock_exec.side_effect = [
+            # pretend lvcreate supports --yes option
+            ('--yes', ''),
+            ('', '')
+        ]
+        expected_calls = [
+            mock.call('lvcreate', '--help'),
+            mock.call('lvcreate', '--yes', '-L', '1000m',
+                      '-n', 'lvname', 'vgname',
+                      check_exit_code=[0])
+        ]
         lu.lvcreate('vgname', 'lvname', 1000)
-        mock_exec.assert_called_once_with('lvcreate', '--yes', '-L', '1000m',
-                                          '-n', 'lvname', 'vgname',
-                                          check_exit_code=[0])
+        self.assertEqual(mock_exec.call_args_list, expected_calls)
+
+    @mock.patch.object(lu, 'vgdisplay')
+    @mock.patch.object(lu, 'lvdisplay')
+    @mock.patch.object(utils, 'execute')
+    def test_lvcreate_old_lvm(self, mock_exec, mock_lvdisplay, mock_vgdisplay):
+        mock_vgdisplay.return_value = [{'name': 'vgname', 'free': 2000},
+                                       {'name': 'some'}]
+        mock_lvdisplay.return_value = [{'name': 'some'}]
+        mock_exec.side_effect = [
+            # pretend lvcreate does not support --yes option
+            # (which is the case for Ubuntu 14.04)
+            ('--foo', ''),
+            ('', '')
+        ]
+        expected_calls = [
+            mock.call('lvcreate', '--help'),
+            mock.call('lvcreate', '-L', '1000m',
+                      '-n', 'lvname', 'vgname',
+                      check_exit_code=[0])
+        ]
+        lu.lvcreate('vgname', 'lvname', 1000)
+        self.assertEqual(mock_exec.call_args_list, expected_calls)
 
     @mock.patch.object(lu, 'vgdisplay')
     @mock.patch.object(utils, 'execute')
@@ -348,10 +379,15 @@ class TestLvmUtils(unittest2.TestCase):
         mock_vgdisplay.return_value = [{'name': 'vgname', 'free': 2000},
                                        {'name': 'some', 'free': 2000}]
         mock_lvdisplay.return_value = [{'name': 'lvname', 'vg': 'some'}]
+        mock_exec.side_effect = [('--yes', ''), ('', '')]
+        expected_calls = [
+            mock.call('lvcreate', '--help'),
+            mock.call('lvcreate', '--yes', '-L', '1000m',
+                      '-n', 'lvname', 'vgname',
+                      check_exit_code=[0])
+        ]
         lu.lvcreate('vgname', 'lvname', 1000)
-        mock_exec.assert_called_once_with('lvcreate', '--yes', '-L', '1000m',
-                                          '-n', 'lvname', 'vgname',
-                                          check_exit_code=[0])
+        self.assertEqual(mock_exec.call_args_list, expected_calls)
 
     @mock.patch.object(utils, 'execute')
     def test_lvdisplay(self, mock_exec):
diff --git a/fuel_agent/utils/lvm.py b/fuel_agent/utils/lvm.py
index e9ca805..69ef5e4 100644
--- a/fuel_agent/utils/lvm.py
+++ b/fuel_agent/utils/lvm.py
@@ -216,8 +216,14 @@ def lvcreate(vgname, lvname, size):
     # on allocated volume. '--yes' should be passed to avoid waiting for
     # user's confirmation:
     # "WARNING: <signature> signature detected on <device>. Wipe it? [y/n]"
-    utils.execute('lvcreate', '--yes', '-L', '%sm' % size, '-n', lvname,
-                  vgname, check_exit_code=[0])
+    # FIXME: the version of lvm2 shipped with Ubuntu 14.04 does not support
+    # --yes option. fuel-agent should properly decomission the storage
+    # (Ubuntu installer does that just fine).
+    stdout, stderr = utils.execute('lvcreate', '--help')
+    force_opt = '--yes' if '--yes' in stdout else ''
+    cmd = 'lvcreate {force_opt} -L {size}m -n {lvname} {vgname}'.format(
+        size=size, lvname=lvname, vgname=vgname, force_opt=force_opt)
+    utils.execute(*cmd.split(), check_exit_code=[0])
 
 
 def lvremove(lvpath):