sudo mv /path/to/thunderbird /usr/local/
To make thunderbird executable with the command “thunderbird” do (one line):
sudo ln -s /usr/local/thunderbird/thunderbird /usr/local/bin/thunderbird
If you wish to add the new thunderbird to your menu open alacarte with the command “alacarte”:
Select internet , then new item, name it Thunderbird or Thunderbird2.0 if you wish to run it next to the official ubuntu package.
Command is thunderbird.
Click the no icon button and select the thunderbird icon from here: /usr/local/thunderbird/icons
Click ok and make your selection.
Not happy with the new thunderbird ?
sudo rm -rf /usr/local/thunderbird/
sudo rm /usr/local/bin/thunderbird
Remove it from your menu with alacarte.