Upgraded from 10.04 to 12.04 now I don't have notifications on incoming email to Thunderbird on the indicator bar, neither when thunderbird is running nor when it's not. None of the other similar questions answers have helped me. Still no blue envelope. I DO get a notification when the email comes as a temporary OSD, ut the envelope in the indicators menu does not get blue and there is no line for received email under "Mail" althougth it is working for Google Mail.