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Good morning! I'm trying to install R on my PC (16.04; LTS), but the following error ocours: E: Falhou obter http://ppa.launchpad.net/skunk/pepper-flash/ubuntu/dists/xenial/main/source/Sources 404 Not Found I ran the following commands on the terminal: * printf '\n#CRAN mirror\ndeb https://cloud.r-project.org/bin/linux/ubuntu xenial-cran35/\n' | sudo tee -a /etc/apt/sources.list * sudo apt-get update The error ocours when I ran the sudo apt-get update. I tried to see the reason for this error and noticed that the "xenial" folder is not in the address http:...