Superb applications for graphics or photo processing darktable and rawtherapee

If you need to process images, use darktable and rawtherapee

To install in Xubuntu or Ubuntu, open a terminal window and enter the following commands: $ sudo apt-get install darktable rawtherapee <enter>

Once you are done, go ahead and process photographs like a professional. Need I say that this is a good combination to substitute . . . → Read More: Superb applications for graphics or photo processing darktable and rawtherapee

How to fix excessive CPU usage by process tumblerd on XFCE desktop in Linux

Noticed that each time I added or downloaded a file, it resulted in excessive use of the CPU. This happens on XFCE desktop in Linux. Looking up the process list, found that tumblerd was utilizing up to 86% of the CPU and leading all other applications and processes to be very slow. Tumbler is used . . . → Read More: How to fix excessive CPU usage by process tumblerd on XFCE desktop in Linux

How to change the host name of Linux computer

On a Linux computer, you can change the host name anytime you like following the method given below after opening a terminal window.

$ sudo vi /etc/hosts <enter>

127.0.0.1 mycomputer.mydomain.com <enter> :wq

$ sudo vi /etc/hostname <enter> Insert mycomputer.mydomain.com <enter> :wq

$ sudo hostname -F /etc/hostname <enter>

Now check if hostname has changed $ . . . → Read More: How to change the host name of Linux computer

Cannot connect to OpenWRT router using SSH after OpenWRT firmware upgrade

OpenWRT is a very powerful router firmware. Since I wanted to upgrade the router firmware, I took a backup of the configuration and then did a complete erase of the configuration settings at the time of firmware upgrade. After logging in, and setting up SSH as a means to log in to the router, SSH . . . → Read More: Cannot connect to OpenWRT router using SSH after OpenWRT firmware upgrade

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

How to display all email in Plaintext only in the Evolution Email Client

After installing Linux Mint, I found that I did not have an option on the Evolution Preferences -> HTML Messages tab, to make sure that all email I received was only displayed as plain text. The option display was as per Figure 1 below.

Figure 1 Figure 2

If you too do not see the . . . → Read More: How to display all email in Plaintext only in the Evolution Email Client

Install qemu-kvm on Ubuntu Linux

Check if kvm can run on the computer $ sudo kvm-ok <enter>

If it returns lines as follows, then it will work INFO: /dev/kvm exists KVM acceleration can be used

Install qemu-kvm Open a terminal window and enter the commands below. $ sudo apt-get install qemu-kvm libvirt-bin ubuntu-vm-builder bridge-utils virt-viewer virt-manager qemu-system <enter>

$ sudo . . . → Read More: Install qemu-kvm on Ubuntu Linux

How to enable and disable root user in Ubuntu 14.04 LTS

If you ever need to enable the root user in Ubuntu 14.04 LTS linux installation, you can do so as follows: Open a terminal window and type the following commands: $ sudo su -c <enter> # passwd root <enter>

Enter a strong password and restart the computer.

To make sure that you can login as . . . → Read More: How to enable and disable root user in Ubuntu 14.04 LTS

How to disable cell broadcasts on Cyanogen Mod 11 on Note 1 (GT-N7000)

If you installed Cyanogen Mod 11 on a Samsung Galaxy Note 1 (GT-N7000) phone, you would find that your cell phone keeps serving messages. These messages are Cell Broadcasts. In my location, these messages were more than 6 a minute and appeared each time the cell phone tower location waves changed. It becomes too difficult . . . → Read More: How to disable cell broadcasts on Cyanogen Mod 11 on Note 1 (GT-N7000)

Extract the audio from an MP4 video file using avconv

At times, we would like to extract the audio from an MP4 video file. To do this in Linux, open a terminal window in Ubuntu and use the utility called avconv as follows: $ avconv -i MyVideoFile.mp4 -vn -acodec copy MyAudioFile.aac <enter>

where, MyVideoFile.mp4 is your mp4 video file. You can then listen to the . . . → Read More: Extract the audio from an MP4 video file using avconv

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