Unable to locate package nmap & sources.list error

Question

Love to have nmap on my #raspberrypi, but:

root@qwers:/home/pi# apt-get update
Hit:1 http://archive.raspberrypi.org/debian stretch InRelease
Hit:2 https://deb.nodesource.com/node_9.x stretch InRelease
Reading package lists... Done
root@qwers:/home/pi# apt-get install nmap
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package nmap

2. apt-cache search nmap has no result:
3. and /etc/apt/sources.list: No such file or directory

Went trough these steps without any result: apt - "E: Unable to locate package update" when I try to update my system, why? - Ask Ubuntu

Ended up here to: Apt "could not find a distribution template" error - Ask Ubuntu with the result of:

aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Raspbian/stretch

Answer 1

Old question, but if anyone have the same problem, here is my solution:

I had the same problem not being able to find the repositories on just one of my Raspberry Pis. The solution was to add the following to /etc/dhcpcd.conf

static domain_name_servers=8.8.4.4 8.8.8.8

These are Google's DNS IPs but you can change them to any valid DNS

After rebooting everything is great.

Answer 2

Raspbian - unable to locate package mysql-server-5.6 after adding repo - Raspberry Pi Stack Exchange led me to the solution after realized

1. the /etc/apt/sources.list was a broken symlink to /etc/apt/sources.list.d/official-package-repositories.list
2. solution: cp /etc/apt/sources.list.d/nodesource.list /etc/apt/sources.list
3. then deb http://archive.raspbian.org/raspbian/ stretch main added to the list
4. apt-get update
5. apt-get install nmap
6. Success