grep the PIP_OUT and print useful info if the problem is about memory…

… allocation

letsencrypt-auto-source/letsencrypt-auto.template

@@ -271,11 +271,21 @@ UNLIKELY_EOF
         echo "====================================================="
         echo
         echo "Certbot has problem setting up the virtual environment."
-        echo "There maybe some problems with the dependencies, or because "
-        echo "your system has not enough memory to build it."
+
+        if `echo $PIP_OUT | grep -q Killed` && `echo $PIP_OUT | grep -q "allocate memory"` ; then
+          echo
+          echo "Based on your pip output, the problem can likely be fixed by "
+          echo "increasing the available memory."
+        else
+          echo
+          echo "We were not be able to guess the right solution from your pip "
+          echo "output."
+        fi
+
         echo
         echo "Consult https://certbot.eff.org/docs/using.html#problems-with-python-virtual-environment"
         echo "for possible solutions."
+        echo "You may also find some support resources at https://certbot.eff.org/support/ ."
       fi
       rm -rf "$VENV_PATH"
       exit 1