CC-4091: More comprehensive error message for installs on systems with incorrect locale

-done

install_minimal/airtime-install

@@ -107,11 +107,28 @@ echo "* Making sure /etc/default/locale is set properly"
 set +e
 update-locale
 cat /etc/default/locale | grep -i "LANG=.*UTF-\?8"
-set -e
 if [ "$?" != "0" ]; then
-    echo "non UTF-8 default locale found in /etc/default/locale."
+    echo -e " * Fail\n"
+    echo "A non UTF-8 default locale found in /etc/default/locale. Airtime requires
+a UTF-8 locale to run. To fix this please do the following:
+
+Ubuntu:
+Put line 'en_US.UTF-8 UTF-8' (or similar) without quotes to '/var/lib/locales/supported.d/local', 
+replacing any existing lines.
+A list of supported locales is available in '/usr/share/i18n/SUPPORTED'
+Then run 'sudo dpkg-reconfigure locales'
+
+Debian:
+Run 'sudo dpkg-reconfigure locales' and use the interface to select 'en_US.UTF-8 UTF-8' (or similar).
+On the second page select this new locale as the default.
+
+After these changes have been made simply run install again.
+
+Now exiting install...
+"
     exit 1
 fi
+set -e
 
 
 # Check if airtime exists already