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How to turn off the microphone in Ubuntu or Linux Mint?

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How to turn off the microphone in Ubuntu or Linux Mint?

Does your computer have a built-in microphone? Here is how to mute or disable the microphone in Linux (Ubuntu or Linux Mint) in software. Introduction The easiest way to turn off a microphone is to unplug it. So we can be sure that it is no longer picking up anything ... However, on a laptop with a built-in microphone, you can't do it. On the other hand, it is always possible to deactivate it by software. One solution is to mute the microphone input (not its listening), which is equivalent to deactivating it. This is usually done through the GUI, in the Sound settings of the distribution. But, it is also possible to do it in a terminal. However, on a laptop, the microphone can be linked to the integrated webcam. So to deactivate it, just deactivate the webcam. Finally another solution, a little radical, consists in deactivating the sound card. On the other hand, in this case, of course the microphone will be deactivated, but also the other audio inputs / outputs. And you will not h...
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How to enable Num Lock on startup in Linux Mint

On most Linux distributions, the keypad lock (Num Lock or Num Lock key) is inactive on the login screen and must be enabled manually. But, here's how to turn on Num Lock on startup in Linux Mint by default. Prerequisites to modify this preference In Linux Mint, it is possible to activate this key at startup by default by modifying, through the graphical interface, the preferences of the login window. But before you can do this, you must first install an additional package numlockx. Numlockx is a utility that allows you to activate the keypad lock at the initialization of an X11 session (graphical session) or by using a command line. It is available from the repositories for Ubuntu and therefore is also available for Linux Mint. To install it, open a terminal and run the following command: sudo apt install numlockx If you prefer to install it with the GUI, look in the numlockx software manager and install it. Enable Num Lock on Boot in Linux Mint To modify the parameters of the conn...
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How to change DNS server in Ubuntu?

By default, for an individual, when he connects to the Internet, the DNS server addresses provided in DHCP are those of his Internet service provider. But it is possible to choose others. Here is how to change DNS server in Ubuntu (18.04 and 20.04). Prerequisites Have Ubuntu 16.04 or higher Introduction to DNS What is a DNS server? DNS is the abbreviation for Domain Name System. A DNS server is a system whose purpose is to convert an Internet address (www.domainname.ext) into an IP address (physical address of machines connected to a network). This is called domain name resolution. So, for example when you type in your browser www.wikipedia.fr, the DNS server converts the path to the IP address: 78.109.84.114. You can find out this IP address by pinging the domain. For example : ping wikipedia.fr and under Linux you will have an answer of this type PING wikipedia.fr (78.109.84.114) 56 (84) bytes of data. 64 bytes from wikimedia2.typhon.net (78.109.84.114): icmp_seq = 1 ttl = 51 time = ...
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