# Ubuntu 20.04 安装 JDK **URL:** \ **Category:** 程序语言\ **Tags:** java\ **Created:** [May 18, 2021, 5:09pm UTC](https://www.isharkfly.com/t/ubuntu-20-04-jdk/13482 "2021-05-18T17:09:27Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![honeymoose](https://www.isharkfly.com/user_avatar/www.isharkfly.com/honeymoose/32/20796_2.png) [@honeymoose](https://www.isharkfly.com/u/honeymoose)\ **Post date:** [May 18, 2021, 5:09pm UTC](https://www.isharkfly.com/t/ubuntu-20-04-jdk/13482/1 "2021-05-18T17:09:27Z")
如果你对 JDK 和 JRE 有什么误解或者之间有什么关系还不是非常熟悉的话，请自行脑补下。 简单来说就是 JDK 是 JRE 的增强版，含有更多的工具集和 API。 在 Java 开发的时候通常都需要要求安装 JDK。 ## 安装命令 ```auto apt install default-jdk ``` 安装命令非常简单，直接执行上面的命令就行了。 在安装的时候，我们遇到了下面的错误： ```auto Err:1 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jre-headless amd64 11.0.10+9-0ubuntu1~20.04 404 Not Found [IP: 91.189.88.142 80] Err:2 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jre amd64 11.0.10+9-0ubuntu1~20.04 404 Not Found [IP: 91.189.88.142 80] Err:3 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jdk-headless amd64 11.0.10+9-0ubuntu1~20.04 404 Not Found [IP: 91.189.88.142 80] Err:4 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jdk amd64 11.0.10+9-0ubuntu1~20.04 404 Not Found [IP: 91.189.88.142 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jre-headless_11.0.10+9-0ubuntu1~20.04_amd64.deb 404 Not Found [IP: 91.189.88.142 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jre_11.0.10+9-0ubuntu1~20.04_amd64.deb 404 Not Found [IP: 91.189.88.142 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jdk-headless_11.0.10+9-0ubuntu1~20.04_amd64.deb 404 Not Found [IP: 91.189.88.142 80] E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jdk_11.0.10+9-0ubuntu1~20.04_amd64.deb 404 Not Found [IP: 91.189.88.142 80] E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? ``` 显示的 IP 地址和仓库的问题。 建议你运行下面命令： ```auto apt update ``` 来对你的操作系统更新下。 ![ubuntu-jdk-version](https://www.isharkfly.com/images/transparent.png) 上面的图片显示了在 ubuntu 系统中成功安装了 JDK。