content: This is more to do with lack of updates for Android 6.0 (which hasn't received updates since 10/3/2017) than it does with Let'sEncrypt. It seems Let'sEncrypt has secured their own root certificate which isn't trusted by Android 6.0 because it didn't exist when the last security update for 6.0 was released. This is more of a failing of joogle and manufacturers failing to update their devices than it is of letsencrypt. The workaround to this is to not use the built in chrome browser, switch to something like Brave. Side note, that josh ass guy is a shitlib faggot.