потребовался пакет dirmngr

java8

echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
apt-get install oracle-java8-installer

если через proxy, то добавить опцию

--keyserver-options http-proxy="http://your_proxy_server:port"

java11
https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-debian-10
https://www.oracle.com/technetwork/java/javase/downloads/jdk13-downloads-5672538.html - отсюда скачать

sudo apt install software-properties-common
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EA8CACC073C3DB2A
sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java11-installer-local