Ubuntu installation docker ee problems encountered can not find the installation source disco Release

Warehouse "https://storebits.docker.com/ee/ubuntu/*********/ubuntu disco Release" Release file no.

 I opened the website, found no disco this thing, although I do not know what is  

Solution:

sudo add-apt-repository \
   "deb [arch=$(dpkg --print-architecture)] $DOCKER_EE_URL/ubuntu \ xenial \ stable-$DOCKER_EE_VERSION"

修改第三行 为指定库 应该这个意思
然后在运行这个命令
问题解决 安装成功