Have you ever got this error message "Cannot Access PPA (ppa url) to get PPA Information, please check your internet connection"? But in the same time we can browsing some webpage and download files. Why we can't acces the ppa? After search on the forum i get the answer, it's because of what we type in terminal

For example in the screenshot below is

sudo add-apt-repository ppa:irie/Blender

cannot access PPA to get the information

We need to change all letters to lowercase, so we can add the ppa repository in our machine. The code look like this

sudo add-apt-repository ppa:irie/blender

After change all letters into loweracase, the ppa can be added

add ppa success

I hope can help everyone who are frustrated because can't  ppa to repository list :D