[lubuntu] Can not start Thunderbird after UBUNTU update

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http://ubuntuforums.org – I aim new to Ubuntu coming from Fedora 14-LXDE. I tried first Lubuntu 11.10 and now I have peppermint two on my acer aspire one L110 Z5; 512MBRAM; 8GB SSD; yesterday under peppermint I upgraded the base OS, which was LUBUNTU 11.04 to 11.10 With LUBUNTU 11.04 Thunderbird worked well. However, with LUBUNTU 11.10 either as OS or under peppermint environment it stopped working. After booting in both cases I got, when trying to start Thunderbird, the following error message: Quote: Thunderbird is already running, but is not responding. To open a new window, you must first close the existing Thun (Hardware)