If you are in Ubuntu you can do this:
Open a terminal and follow the following steps.
$ sudo add-apt-repository ppa:mozillateam/thunderbird-stable
press enter then
type your password and press enter again and type
$ sudo apt-get update
press enter and type your password if prompted press enter again and type
$ sudo apt-get install thunderbird
press enter again, type password again and press enter again.
If you are in Linux Mint It might work too who knows.
Good luck to you