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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Resolving Key Exchange Failure When Connecting with SecureCRT to OpenSSH

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Recently, after installing OpenSSH on my Ubuntu 22.04 laptop, I encountered a challenge while trying to establish a connection using SecureCRT.

An error message appeared:

Key exchange failed.
No compatible key-exchange method. The server supports these methods:
  curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,kex-strict-s-v00@openssh.com
The following key-exchange method(s) are supported but not currently allowed for this session:
  curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,sntrup761x25519-sha512@openssh.com,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,kex-strict-s-v00@openssh.com,curve25519-sha256
Key-exchange methods can be turned on in the Session Options dialog in the Connection/SSH2 Category.

This error indicates a mismatch in the key-exchange algorithms supported by the server (OpenSSH in this case) and the client (SecureCRT).

Root Cause:

The root of this issue lies in the key exchange method. SecureCRT and OpenSSH must agree on a method to securely establish a communication channel. When they don't support a common method, you'll encounter this error.

Solution:

To resolve this issue, you need to modify the session settings in SecureCRT to include a key exchange method compatible with your OpenSSH server. Here are the steps:

  1. Open SecureCRT and navigate to the session options for the connection in question.
  2. Go to the SSH2 category.
  3. In the 'Key Exchange' section, add "diffie-hellman-group14-sha256" to the list of methods.

This addition ensures that SecureCRT includes a key exchange algorithm that is compatible with the OpenSSH server, specifically one that the server supports.

You can use SSH client commands to attempt a connection to the server and have it display the list of supported key exchange algorithms. This method is useful when the server is running.

jason@GU502DU:~$ ssh -Q KexAlgorithms
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256 -> (*)
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256

Conclusion:

Key exchange errors can be a common hurdle in setting up secure connections, but they are usually resolvable through configuring the client to support the server's protocols. By understanding and aligning the key exchange methods between your client and server, you can establish a secure and reliable SSH connection.






Location: Coquitlam, BC, Canada

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