OpenFoam安装报错：E: Unable to locate package openfoam6

报错

在使用Ubuntu18.04安装OpenFoam-6时，按照安装教程安装时（非源码编译），输入sudo apt-get -y install openfoam6时报错：

runner@ubuntu:/opt$ sudo apt-get -y install openfoam6
[sudo] password for runner: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package openfoam6

解决方案

20220906测试阿里云源可用，故使用阿里云源。

1. 启动终端，输入：

sudo gedit /etc/apt/sources.list

2. 在打开的文件中第一行插入下面内容，随后保存并关闭。

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

3. 输入如下命令更新缓存（第一行必须执行，第二行可以不执行），这需要花费一些时间。

sudo apt-get update
sudo apt-get upgrade

4. 随后重新执行安装教程（非源码编译）命令即可（先前执行过的依然要执行）

sudo sh -c "wget -O - https://dl.openfoam.org/gpg.key | apt-key add -"
sudo add-apt-repository http://dl.openfoam.org/ubuntu
sudo apt-get update
sudo apt-get -y install openfoam6

安装过程中其他问题请参阅安装教程（非源码编译）