在Ubuntu 18.04上从官方存储库安装Skype的方法：
1.echo "deb [arch=amd64] https://repo.skype.com/deb stable main" | sudo tee /etc/apt/sources.list.d/skype-stable.list
2. wget https://repo.skype.com/data/SKYPE-GPG-KEY
3. sudo apt-key add SKYPE-GPG-KEY
4.sudo apt install apt-transport-https
5.sudo apt update
6.sudo apt install skypeforlinux
7.skypeforlinux
