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Ubuntu Linux

I read your Nginx and Let’s Encrypt free SSL certificate tutorial. However, I use Lighttpd web server on AWS cloud. How do I secure my Lighttpd web server with Let’s Encrypt free SSL certificate on my Ubuntu Linux 16.04 LTS or Debian Linux 8.x server?
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Ubuntu Linux Remove/Delete PPAs apt-get command

Over time I have added way too many PPAs using the add-apt-repository command on Ubuntu Linux 16.04 LTS server for testing purpose. How can I delete or remove those PPAs? Is there a command to list all PPAs?
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How to extract a .deb file without opening it on Debian or Ubuntu Linux

I downloaded a .deb Debian file. How do I extract deb package without installing it on my Debian or Ubuntu Linux based system? How do I list and extract the contents of a Debian package?
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I want to share my web server DocumentRoot /var/www/html/ across 2 Apache web server. Both of my web servers are behind load balanced reverse proxy powered by Nginx. How do I setup and install GlusterFS (“distributed storage”) which is a scalable network filesystem on Ubuntu Linux 16.04 LTS server?
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How to wipe a signature from a disk device on Linux with wipefs command

I recently decommissioned Debian Linux based nas server and moved disk from my nas server to Linux-powered desktop. However, when I run fdisk command, I am getting the following error:
    /dev/sdb: device contains a valid ‘LVM2_member’ signature; it is strongly recommended to wipe the device with wipefs(8) if this is unexpected, in order to avoid possible collisions
What is a wipefs and how do I use it on Linux?
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How to install and configure Varnish cache on Ubuntu Linux 16.04 LTS

How do I install Varnish Cache server to improve the performance of my existing Apache web server especially caching dynamic content on Ubuntu Linux 16.04 LTS server?
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How to enable KVM virsh console access for Ubuntu Linux VM

I just followed your tutorial and setup KVM with Ubuntu Linux as a new guest virtual machine. However, I am unable to use the command: ‘virsh console vm’. How do I setup and enable console access in order to gain shell access on the newly created Ubuntu Linux 16.04 LTS VM?
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How to enable proposed archive repo on Ubuntu Linux to install packages

How do I enable the proposed archive for Ubuntu 16.04 LTS use the apt-get to installed selected kernel updated that is not released yet?
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How to open ssh port using ufw on Ubuntu/Debian Linux

How do I allow incoming SSH connections from a specific IP address or subnet on a Ubuntu or Debian Linux server using ufw?
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How to install denyhosts on Ubuntu Linux 16.04 LTS ( intrusion prevention security tool )

I host my blog in cloud server, and I set up ssh to manage my Ubuntu Linux 16.04 LTS server. However, I noticed lots of break in and brute-force attacks on my ssh server? How can I stop hacking attempts into my system?
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