diff --git a/utils/ssh.py b/utils/ssh.py
index abbd89f..e9e5f3a 100644
--- a/utils/ssh.py
+++ b/utils/ssh.py
@@ -204,13 +204,14 @@
             home_ubuntu = "/home/ubuntu/"
             transport.put_iperf3_deb_packages_at_vms(path_to_iperf_deb,
                                                      home_ubuntu)
-            transport.exec_command('sudo dpkg -i {}*.deb'.format(home_ubuntu))
+            exit_status, stdout, stderr = transport.exec_sync(
+                'sudo dpkg -i {}*.deb'.format(home_ubuntu))
         else:
             logger.info("Installing iperf, iperf3 using apt")
             preparation_cmd = config.get('iperf_prep_string') or ['']
             transport.exec_command(preparation_cmd)
-            transport.exec_command('sudo apt-get update;'
-                                   'sudo apt-get install -y iperf3 iperf')
+            exit_status, stdout, stderr = transport.exec_sync(
+                'sudo apt-get update && sudo apt-get install -y iperf3 iperf')
 
         # Log whether iperf is installed with version
         check = transport.exec_command('dpkg -l | grep ii | grep iperf3')
@@ -221,8 +222,9 @@
             else:
                 info = "Could not put offline iperf packages from {} to the " \
                        "VM.".format(path_to_iperf_deb)
-            raise BaseException("iperf3 is not installed at VM with FIP {}. {}"
-                                "".format(fip, info))
+            raise BaseException("iperf3 is not installed at VM with FIP {}. "
+                                "{}.\nStdout, stderr at VM:\n{}\n{}"
+                                "".format(fip, info, stdout, stderr))
         # Staring iperf server
         transport.exec_command('nohup iperf3 -s > file 2>&1 &')
         transport.exec_command('nohup iperf -s > file 2>&1 &')