Elementary OS - show update out of date

Your Elementary OS show a warning/alert like the following:

The update information is outdated. This may be caused by.......

Using one or more PPAs that don't work might cause this problem sometimes. Run

sudo apt-get update

to check which PPAs are causing the error and remove them if necessary.

In this case, the Google Chrome PPA don't work:

 

Solution:

Run the following three commands:

sudo sed -i -e 's/deb http/deb [arch=amd64] http/' "/etc/apt/sources.list.d/google-chrome.list"
sudo sed -i -e 's/deb http/deb [arch=amd64] http/' "/opt/google/chrome/cron/google-chrome"
sudo apt-get update

 

Problem fixed.

 

Reference:

http://elementaryos.stackexchange.com/questions/596/how-can-i-get-rid-of-the-update-information-is-outdated-warning

http://www.omgubuntu.co.uk/2016/03/fix-failed-to-fetch-google-chrome-apt-error-ubuntu

Elementary OS - show update out of date