ubuntu can't update chrome code example

Example 1: update google chrome command ubuntu

sudo apt-get --only-upgrade install google-chrome-stable

Example 2: Ubuntu Can't update chrome

CHROME:
wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
sudo sh -c 'echo "deb http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt-get update
sudo apt-get install google-chrome-stable

CHROMIUM:
sudo add-apt-repository ppa:a-v-shkop/chromium
sudo apt-get update
sudo apt-get install chromium-browser