As Michael suggested above, you can get Lightning from there: https://help.ubuntu.com/community/ThunderbirdLightning . So far, after about a month of use, I have had no problems with the 64bit version, so with no other alternative I will just continue using it.
As Michael suggested above, you can get Lightning from there: https:/ /help.ubuntu. com/community/ ThunderbirdLigh tning . So far, after about a month of use, I have had no problems with the 64bit version, so with no other alternative I will just continue using it.