Failed to fetch http://deb.debian.org/debian/dists/stretch/InRelease [duplicate]

This question already has an answer here: How to add Debian Universe in etc/apt/sources.list? 1 answer I want to update the source of apt sudo apt-get update but I got the error message below: E: Failed to fetch http://deb.debian.org/debian/dists/stretch/InRelease Unable to find expected entry ‘universe/source/Sources’ in Release file (Wrong sources.list entry or malformed file) E:…

Details