我正在尝试在 docker 映像中安装 java7。这一直工作到几天前。命令是：
apt-get --fix-missing update
apt-get -y upgrade
apt-get -y install software-properties-common
add-apt-repository ppa:webupd8team/java
apt-get -y upgrade
apt-get -y update
echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections
apt-get install -y oracle-java7-installer
输出是：
Setting up oracle-java7-installer (7u80+7u60arm-0~webupd8~1) ...
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to …