我也有同样的问题，但没有一条评论对我有用。最后，我注意到我禁用了我的更新。当我重新激活它，所以sudo apt-get更新工作正确，问题得到解决。 (更新系统设置>软件和更新>更新选项卡 这里我勾选了两个重要更新和推荐更新的第一个选项)。

你可以使用SDKMan，

curl -s "https://get.sdkman.io" | bash
source "~/.sdkman/bin/sdkman-init.sh"
sdk install java

如果你想使用Java 10之外的AdoptOpenJDK发行版，你可以使用AdoptOpenJDK网站上描述的官方存储库(也适用于Debian):

Import the official AdoptOpenJDK GPG key by running the following command: wget -qO - https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | sudo apt-key add - Import the AdoptOpenJDK DEB repository by running the following command: sudo add-apt-repository --yes https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ If you get a command not found error, try running: apt-get install -y software-properties-common Then repeat the first command. Refresh your package list with apt-get update and then install your chosen AdoptOpenJDK package. For example, to install OpenJDK 8 with the HotSpot VM, run: apt-get install <adoptopenjdk-8-hotspot>

您可以在https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/pool/main/a/下找到可用的软件包名称/ Java版本

按照这个视频，我已经成功地在Ubuntu 18.04 LTS上安装了JDK 10。

我正在复制视频描述的节选。

只要打开终端，然后输入以下命令:

Java安装(PPA)

sudo add-apt-repository ppa:linuxuprising/java
sudo apt-get update
sudo apt-get install oracle-java10-installer

用于设置环境变量(使java10默认)

sudo apt-get install oracle-java10-set-default

在Ubuntu 16.04、Linux Mint、Debian等Linux系统上安装JDK 10的方法相同。

Sun-java6-jdk是由oracle-java8-installer或oracle-java7-installer或oracle-java7-installer提供的虚拟包。

sudo apt-get install oracle-java8-installer  

会给你sun-java6-jdk。

参考问Ubuntu问题如何设置OpenJDK的JAVA_HOME ?，

如何在Ubuntu (Linux)下安装Open JDK (Java开发工具包)?

Open Terminal from Application Dash or press Ctrl+Alt+T Update repository: sudo add-apt-repository ppa:openjdk-r/ppa # only Ubuntu 17.4 and earlier sudo apt update Optional: To search available distributions of openjdk, use the following command: apt search openjdk Install the appropriate version with the following command: sudo apt install openjdk-8-jdk sudo apt install openjdk-8-source #this is optional, the jdk source code For JAVA_HOME (Environment Variable) type command as shown below, in "Terminal" using your installation path... export JAVA_HOME=/usr/lib/jvm/java-8-openjdk (Note: /usr/lib/jvm/java-8-openjdk is symbolically used here just for demostration. You should use your path as per your installation.) For PATH (Environment Variable) type command as shown below, in Terminal: export PATH=$PATH:$JAVA_HOME/bin To check your installation: java -version