How to upgrade SkyPe via Linux ubuntu OS??

1. sudo apt-get upgrade skypeforlinux (if upgrade only)

2. sudo apt-get install skypeforlinux

3. curl https://repo.skype.com/data/SKYPE-GPG-KEY | sudo apt-key add -

4. echo "deb [arch=amd64] https://repo.skype.com/deb stable main" | sudo tee /etc/apt/sources.list.d/skype-stable.list

5. sudo apt-get update

6. sudo apt install skypeforlinux