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Whenever trying to install some programs from source, or specifically running apt update, I receive this message:

E: The repository 'http://ftp.ca.debian.org/debian stretch/updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I started getting this after adding the architecture i386. Without it, I would not be able to install the proprietary Nvidia driver, and Steam client would not start at all. This is what my /etc/apt/sources.list reads:

deb http://ftp.ca.debian.org/debian/ stretch main contrib non-free
deb-src http://ftp.ca.debian.org/debian/ stretch main contrib non-free

deb http://ftp.ca.debian.org/debian/ stretch/updates main contrib non-free
deb-src http://ftp.ca.debian.org/debian/ stretch/updates main contrib non-free

####stretch-updates, previously known as 'volatile'

deb http://ftp.ca.debian.org/debian/ stretch-updates main contrib non-free

deb-src http://ftp.ca.debian.org/debian/ stretch-updates main contrib non-free
GAD3R
  • 66,769

2 Answers2

51

You’ve got both stretch-updates and stretch/updates, but the latter doesn’t exist any more (at least on the mirror you’re using). You should remove the references to stretch/updates, or — if you’re expecting the stretch/updates lines to provide security updates — replace them with

deb http://security.debian.org/ stretch/updates main contrib non-free

In late April 2023, the Stretch repositories were removed from the main mirrors, so you’ll need to switch to archive.debian.org; see apt-get update failed to fetch debian amd64 packages while building dockerfile from maven:3.5.2-jdk-8 and Security repo for Debian stretch not working anymore for details.

Stephen Kitt
  • 434,908
32

Run the following command and it should be fixed

echo "deb http://archive.debian.org/debian stretch main contrib non-free" > /etc/apt/sources.list

or change the repository website deb.debian.org to archive.debian.org by running:

sed -i s/deb.debian.org/archive.debian.org/g /etc/apt/sources.list

and if there is security too (security.debian.org) then:

sed -i s/security.debian.org/archive.debian.org/g /etc/apt/sources.list

the reasons