前几天在捣鼓我那Android 6.0的老平板，想装上termux，但termux需要至少Android 7.0，搜了许久，才发现termux官方已经给出答案了。
下载好termux后，需要修改$PREDIX/etc/apt/source.list，在Termux on android 5 or 6 · termux/termux-app Wiki (github.com)已给出：
deb https://packages.termux.dev/apt/termux-main-21 stable main
deb https://termux.dev/science-packages-21-bin science stable
deb https://termux.dev/game-packages-21-bin games stable
deb https://termux.dev/termux-root-packages-21-bin root stable
但是发现好像还不行，找了半天找到了在 Android 5.x.x-6.x.x 使用 Termux_ZXF-BW的博客-CSDN博客这篇文章，运行里面的代码后可以正常安装软件了。
cd ~
export apt_path=$PREDIX/etc/apt
# 换官方源
echo "deb https://packages.termux.dev/termux-main-21/ stable main" > $apt_path/sources.list
echo "deb https://termux.dev/game-packages-21-bin games stable" > $apt_path/sources.list.d/game.list
echo "deb https://termux.dev/termux-root-packages-21-bin root stable" > $apt_path/sources.list.d/root.list
echo "deb https://termux.dev/science-packages-21-bin science stable" > $apt_path/sources.list.d/science.list
# 添加第三方源its-pointless
curl -o setup-pointless-repo.sh https://its-pointless.github.io/setup-pointless-repo.sh
chmod 777 setup-pointless-repo.sh
./setup-pointless-repo.sh
# 更新并升级
apt update && apt upgrade