Changing the Default Terminal to Terminator on Ubuntu

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Terminator is a powerful tool for developers, allowing you to manage multiple terminal sessions in a single window. Features like splitting panes, tabs, and simultaneous input can significantly boost your productivity. Step 1: Install Terminator First, install Terminator using the apt package manager. sudo apt update sudo apt install terminator -y The -y option automatically answers 'yes' to any prompts during the installation process, streamlining the setup. Step 2: Set as the System Default Ubuntu uses a utility called update-alternatives to manage default applications. We'll use this tool to change the default terminal emulator ( x-terminal-emulator ) to Terminator. Run the Configuration Command Enter the following command in your terminal. A list of available terminals will appear. sudo update-alternatives --config x-terminal-emulator Select Terminator From the resulting list, enter the selection number corresponding to terminator and press Enter. ...
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How to enable ssh server and client on Ubuntu

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openssh

Introduction

SSH (Secure Shell) is a network protocol used to securely communicate between two computers and transfer data. One of the main features of SSH is that it works well on insecure networks, as the communication channel is encrypted. The most widely-used SSH implementation is the OpenSSH suite, which includes the following tools:

  • Remote operations: ssh, scp, sftp
  • Key management: ssh-add, ssh-keysign, ssh-keyscan, ssh-keygen
  • Service-side tools: sshd, sftp-server, ssh-agent

Environment

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.4 LTS
Release:        22.04
Codename:       jammy

$ uname -r
6.8.0-57-generic

Install OpenSSH Server and Client

OpenSSH client is usually pre-installed on Ubuntu. To accept SSH connections, install the server component:

$ sudo apt update
$ sudo apt install openssh-server openssh-client

Verify installation:

$ ssh -V
OpenSSH_8.9p1 Ubuntu-3ubuntu0.13, OpenSSL 3.0.2 15 Mar 2022

Allow SSH Port (22) Through the Firewall

Ubuntu uses UFW as the default firewall. Allow SSH with the following commands:

$ sudo ufw allow ssh
Rule added
Rule added (v6)

$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup

$ sudo ufw status
Status: active
To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       Anywhere
22/tcp (v6)                ALLOW       Anywhere (v6)

Start and Enable SSH Service

Use systemctl to start and enable the SSH server (sshd):

$ sudo systemctl start ssh
$ sudo systemctl enable ssh

Check SSH Service Status and Listening Port

$ sudo systemctl status ssh
● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2025-04-24 08:18:00 PDT; 2min 3s ago
       Docs: man:sshd(8)
             man:sshd_config(5)
   Main PID: 3104741 (sshd)
      Tasks: 1 (limit: 18790)
     Memory: 1.7M
        CPU: 25ms
     CGroup: /system.slice/ssh.service
             └─3104741 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"

Apr 24 08:18:00 GU502DU systemd[1]: Starting OpenBSD Secure Shell server...
Apr 24 08:18:00 GU502DU sshd[3104741]: Server listening on 0.0.0.0 port 22.
Apr 24 08:18:00 GU502DU sshd[3104741]: Server listening on :: port 22.
Apr 24 08:18:00 GU502DU systemd[1]: Started OpenBSD Secure Shell server.

Test SSH Connection on Loopback

Try connecting to your own machine to verify SSH is working:

$ ssh your_username@127.0.0.1

First-time connection prompt:

$ ssh jason@127.0.0.1
The authenticity of host '127.0.0.1 (127.0.0.1)' can't be established.
ED25519 key fingerprint is SHA256:y+fnvwQ29kzrFIrvXBEl7NXd9ZdjdZsj6xDaCKY94Tc.
This host key is known by the following other names/addresses:
    ~/.ssh/known_hosts:1: [hashed name]
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.
jason@127.0.0.1's password: 
Welcome to Ubuntu 22.04.4 LTS (GNU/Linux 6.8.0-57-generic x86_64)

If you see the login prompt and connect successfully, your SSH server and client setup is working properly!


Location: Calgary, AB, Canada

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