Just today, Raspberry Pi Foundation released a new version of its Raspbian Operating System, version 2.4.3. If you have been using OS 2.4.2 and below, you will notice that today's new launch of the OS breaks the APT-GET repository link for your Raspberry Pi. I've been struggling with this problem for the entire afternoon, just before I got to know that a new OS has been released. The issue for the broken APT-GET repository link was likely due to the renaming of its OS from Jessie to Stretch.TL:DR, there are two ways to quickly fix this problem for users running OS 2.4.2 and below:
1) You can DOWNLOAD the new OS from Raspberry Pi
OR
2) Manually updating the repository link by performing the following command
Change the word "jessie" you see in the following text documents to "stretch"
sudo nano /etc/apt/sources.list
sudo nano /etc/apt/sources.list.d/raspi.list
After saving the text documents, perform the following commands
sudo apt-get update
sudo apt-get dist-upgrade
