Run `sudo apt-get update` and then install signal using `sudo apt-get install signal`.
Note that this repository is not officially supported by Kali Linux, so use it at your own risk.
However, if you want to speed up the downloading of build dependencies when building packages with sbuild, consider setting up a caching proxy like apt-cacher-ng:
1. Install apt-cacher-ng using `sudo apt install -y apt-cacher-ng`
2. Add your Kali mirrors to /etc/apt-cacher-ng/kali_mirrors and set up a backend for the mirror that is closest to you in /etc/apt-cacher-ng/backends_kali (see examples below)
3. Create a configuration file at /etc/apt-cacher-ng/kali.conf with the following content:
# Install apt-cacher-ng package with -y flag for automatic yes to prompts
sudo apt install -y apt-cacher-ng
# Add Kali mirrors to /etc/apt-cacher-ng/kali_mirrors file
# and set up a backend for the closest mirror in /etc/apt-cacher-ng/backends_kali file
# Note: Examples of how to add mirrors and set up backends can be found in the files themselves
# This allows for efficient caching of Kali packages for faster installation
Remap-klxrep: file:kali_mirrors /kali ; file:backends_kali
# Create a configuration file at /etc/apt-cacher-ng/kali.conf
# with the following content:
# This configuration file specifies the settings for caching Kali packages
# and can be customized to fit specific needs
sudo nano /etc/apt-cacher-ng/kali.conf
4. Enable apt-cacher-ng using `sudo systemctl enable apt-cacher-ng –now`
5. Run tail -f /var/log/apt-cacher-ng/apt-cacher.log while building a package with sbuild to check that everything is working properly and packages are being cached in /var/cache/apt-cacher-ng/klxrep/.
Here’s an example of what your kali_mirrors file might look like:
# This script is used to configure the kali_mirrors file for apt-cacher-ng
# It enables apt-cacher-ng and checks that packages are being cached properly
# Enable apt-cacher-ng and start it
tl enable apt-cacher-ng --now
# Check the apt-cacher-ng log file in real-time
tail -f /var/log/apt-cacher-ng/apt-cacher.log
# Add kali mirrors to the kali_mirrors file
# The first line is the main kali repository
# The second line is the kali archive repository
# The third line is the kali security repository
# These repositories will be used to download packages
# and they will be cached in /var/cache/apt-cacher-ng/klxrep/
# Main kali repository
http://http.kali.org/kali/
# Kali archive repository
https://archive.kali.org/kali
# Kali security repository
https://security.kali.org/kali-security
And here’s an example of what your backends_kali file might look like:
# This script contains a list of URLs for Kali Linux mirrors.
# The following URLs are for different mirrors of Kali Linux, which are used for downloading the operating system.
# The first URL is for the main Kali Linux mirror at mirrors.kernel.org.
# The second URL is for the mirror at ftp.osuosl.org, which is another popular choice for downloading Kali Linux.
# The third URL is for the mirror at mirror.iweb.com, which is another reliable option for downloading Kali Linux.
Note that you should replace these URLs with the ones closest to your location for optimal performance.