Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? The command '/bin/sh -c apt-get install -y libpq-dev' returned a non-zero code: 100 code example

Example 1: E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

sudo apt-get clean

Example 2: E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

sudo apt-get clean