将以下行添加到您的/etc/apt/sources.list中，将<mydist>替换为对应的发行版代号，18.04为bionic
echo "deb [arch=amd64] https://download.virtualbox.org/virtualbox/debian bionic contrib" >> /etc/apt/sources.list
wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox遇到以下签名无效时该怎么办：BADSIG ...从存储库刷新软件包时？
sudo -s -H
apt-get clean
rm /var/lib/apt/lists/*
rm /var/lib/apt/lists/partial/*
apt-get clean
apt-get update