Fix “The Update Information Is Outdated”

Sometimes, the message "The Update Information Is Outdated" is displayed when you click on a red warning red icon in the status bar. It happened to me last week. This time, it was caused by a Google Chrome update that failed. First, open a terminal (Control + Alt + T) and run the command

sudo apt-get update

If you get an error message related to Google, you can fix it by editing the /etc/apt/sources.list.d/google-chrome.list file. You can do so by issuing the previously opened terminal window

sudo gedit /etc/apt/sources.list.d/google-chrome.list

Make sure that the repository line looks like

deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main