Ubuntu 18.04 有 libemu-dev 软件包，但 Ubuntu 20.04 似乎缺少该软件包。libemu-dev 是否已在 20.04 中停用，还是将来会添加？有没有办法在 20.04 中安装 libemu-dev？
https://www.ubuntuupdates.org/package/core/bionic/universe/base/libemu-dev
答案1
打开终端并输入：
sudo apt update
cd ~/Downloads
wget http://archive.ubuntu.com/ubuntu/pool/universe/libe/libemu/libemu2_0.2.0+git20120122-1.2build1_amd64.deb http://archive.ubuntu.com/ubuntu/pool/universe/libe/libemu/libemu-dev_0.2.0+git20120122-1.2build1_amd64.deb
sudo apt install ./libemu2_0.2.0+git20120122-1.2build1_amd64.deb ./libemu-dev_0.2.0+git20120122-1.2build1_amd64.deb