ubuntu更换国内源下载tensorflow-lite armhf

你可以按照以下步骤更换Ubuntu的软件源，然后再下载tensorflow-lite armhf：

1. 打开终端，输入以下命令备份原始的软件源列表文件：

   sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2. 编辑软件源列表文件，将所有的源地址更换为国内的镜像站点。以清华大学的镜像站点为例，可以运行以下命令：

   sudo gedit /etc/apt/sources.list

然后将文件中的所有源地址替换为以下内容：

   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
   deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
   deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
   deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
   deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
   deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse

3. 更新软件源列表：

   sudo apt-get update

4. 安装tensorflow-lite armhf：

   sudo apt-get install tensorflow-lite:armhf

如果提示找不到该软件包，请尝试运行以下命令更新软件包列表：

   sudo apt-get update

然后再尝试安装tensorflow-lite armhf。