tmux is a very useful tool when working with the terminal. It basically allows you to start multiple sessions and each one of these sessions can have multiple panes inside it. tmux is a terminal tool focused on window and session management. tmux is available for: Debian/Ubuntu, Fedora, RHEL/CentOS, Arch Linux, OpenSUSE, macOS.

Your network interface might not act properly by not having an speed unknown value for example and this is sometimes caused by an abnormal MTU value for your network interface. You can change that using the ifconfig command.

On some machines running Ubuntu frequently, you can easily restart (down/up state) a network interface by ultimately using the ifconfig command.

Ubuntu server 18.04 LTS

1. Check the Apache2 process status

sudo /etc/init.d/apache2 status 

If you’re seeing an “Active (running)“ message then it means that your Apache2 process is still running and we need to stop it.

2. Stop the Apache2 process

sudo /etc/init.d/apache2 stop

3. Check the Apache2 process status, again.

sudo /etc/init.d/apache2 status

Notice that now, the “Active” section says “inactive“.

4. Uninstall Apache2 by purging.

sudo apt-get purge apache2* -y

5. Verify if anything related to the Apache2 service has been removed

 sudo apt-get autoremove -y

6. Verify if any file or folders have been left on the server.

whereis apache2

If the result/output of the command above is empty, then Apache2 has been successfully uninstalled from your Ubuntu 18.04 LTS.

OpenVPN is a software compatible with both Windows and Linux, often used in corporations for creating secure connections towards their own internal IT infrastructure.

Install OpenVPN on Ubuntu 18.04/20.04 LTS

Open your Ubuntu terminal and type:

sudo apt-get install openvpn openvpn-systemd-resolved 

Run OpenVPN on Ubuntu 18.04/20.04 LTS

Open your Ubuntu terminal and type:

sudo openvpn --config path-to-openvpn-config-file.ovpn

After running OpenVPN, the system will require you to enter your local super user (if prompted) and after that, for your OpenVPN user and password.