After manually installing Mozilla Thunderbird on Debian 8 Jessie according to this instructions, and it's working fine. However, I cannot update it!
Thunderbird self warns me that an available update could not start automatically. Even manually I've not managed to update it. I've tried this by going to the directory
and executing the (green [*])
I'm pretty new to Linux, so please do understand if there might be some lack of termini precision.
$ ls -la shows the files in different colors.