How to extract Opus audio from MKV file

To extract the opus audio from mkv file, open a terminal window and enter the following command:

$ ffmpeg -i Attention.mkv -acodec copy -vn audio.opus <enter>

. . . → Read More: How to extract Opus audio from MKV file

How to find out the audio stream using ffmpeg in .mkv file

To find out the audio stream in the .mkv file using ffmpeg, open a terminal window and enter the following command:

$ ffmpeg -i aaa.mkv <enter>

How to quickly create a 150 GB file on Ubuntu

There are various methods to create a 150 GB file on Linux, but the fastest way to do so is to use fallocate. Open a terminal window and enter the command below:

$ fallocate 150G filename <enter>

The above command creates a 150 gb file named filename.

. . . → Read More: How to quickly create a 150 GB file on Ubuntu

Wireless Adapter not detected in Linux Mint 19.1 on Dell Inspiron 5580

On a Dell Inspiron 5580, the wireless adapter is of Intel. The same is not detected when installing Linux Mint 19.1 the first time. This is because of the kernel not being updated.

Once Linux Mint 19.1 is installed, the later kernel 4.15.0-52 installed upon update, makes the wireless adapter work.

. . . → Read More: Wireless Adapter not detected in Linux Mint 19.1 on Dell Inspiron 5580

System scaling in Linux on 1920×1080 display (HiDPI)

Note system scaling works out of box with Cinnamon desktop. Open a terminal window and install it with:

$ sudo apt-get install cinnamon-desktop-environment <enter>

To do system scaling in the Gnome Desktop Environment, install the gnome-tweak tool. To do so, open a terminal window and enter the command as below:

. . . → Read More: System scaling in Linux on 1920×1080 display (HiDPI)

How to find out time taken in Linux by processes when starting the computer

To identify which system processes take how much time when booting your Linux system, open a terminal window, at type the following command:

$ sudo systemd-analyze blame <enter>

How to calculate MD5 or SHA256 sums in Linux and Android

Many of us use Linux Distributions like Ubuntu, Fedora, available for free on the Internet. To install these distributions on our computers, we need to down their ISO files. Recently, the Linux Mint ISO was hacked and malware inserted into some of it’s files. It was then repacked and put up on an external website. . . . → Read More: How to calculate MD5 or SHA256 sums in Linux and Android

Evolution always asks for password when sending or receiving emails on Linux Mint

Evolution always asks for password when sending or receiving emails on Linux mint because Evolution uses gnome-keyring files. To resolve, do the following steps:

$ cd /usr/bin <enter> $ sudo ln -s mate-keyring gnome-keyring <enter> $ sudo ln -s mate-keyring-daemon gnome-keyring-daemon <enter>

Delete the files in ~/.config/mate/keyrings Reboot.

Now Evolution will ask for the e-mail . . . → Read More: Evolution always asks for password when sending or receiving emails on Linux Mint

Alternative desktops to Gnome 3 – Mate, Cinnamon

Linux users who find Gnome 3 clunky, now have a choice in desktop environments. You can install Cinnamon or go with Mate, which is fork of the Gnome 2 project. Funny that the Gnome developers did not realize that over time, their interface would introduce inefficiencies or wean away their users to other alternatives.

Personally, . . . → Read More: Alternative desktops to Gnome 3 – Mate, Cinnamon

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