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 add user to sudoers or the adm group on Ubuntu Linux

Use the following command in a terminal window to modify a user’s rights on Linux to make them a member of the adm group $ sudo usermod -a -G sudo,adm username <enter>

where username is the name of the user who you want to make a sudoer.

Not able to mount USB drive in Ubuntu Linux 14.04 after change of UID and GID

After changing the UID and GID (User ID and Group ID numbers), I was not able to mount and USB pen drives or hard drives. This issue can be resolved by entering following commands in a Linux terminal: $ cd /media <enter> $ sudo chown -R user.group user <enter>

where user is the user name . . . → Read More: Not able to mount USB drive in Ubuntu Linux 14.04 after change of UID and GID

Where did ffmpeg on Ubuntu 14.04 LTS go? Use avconv instead

ffmpeg was replaced by libav on the new Ubuntu package list. It is similar, though. ffmpeg -> avconv ffplay -> avplay ffserver -> avserver

You can still convert media files using avconv in place of ffmpeg.

To install avconv, open a terminal window and type following commands: $ sudo apt-get install libav-tools <enter>

. . . → Read More: Where did ffmpeg on Ubuntu 14.04 LTS go? Use avconv instead

How to upgrade Ubuntu to next Ubuntu release from command line

It is relatively easy to upgrade your Ubuntu Linux computer using the GUI. However, if you want to do an upgrade to the next Ubuntu release from the command line or shell prompt, here is the method.

Open a terminal window

At the command prompt, type the following commands:

$ sudo apt-get update <enter> $ . . . → Read More: How to upgrade Ubuntu to next Ubuntu release from command line

How to check if swap is encrypted in Ubuntu

Start up a terminal window and then enter the commands as shown in italics below. The following command will tell you if your swap is encrypted in Ubuntu 12.04.

$ swapon –summary <enter>

Filename Type Size Used Priority /dev/mapper/cryptswap1 partition 3904508 0 -1

Above indicates swap is encrypted. If it returned nothing except the heading, . . . → Read More: How to check if swap is encrypted in Ubuntu

avast can not initialize avast! engine: Invalid argument

When running avast, the following error message is displayed at times:

avast can not initialize avast! engine: Invalid argument

To overcome this error, open a terminal window and enter the following command: $ sudo sysctl -w kernel.shmmax=100000000 <enter>

Now you can start avast and it will work. Note that each time you start avast, you . . . → Read More: avast can not initialize avast! engine: Invalid argument

The following packages have been kept back: Message in Ubuntu when updating packages

If you used the instructions at this post to update your Ubuntu Linux packages, basically, apply patches, you get the following message at times:

The following packages have been kept back: <list of packages>

This basically prevents the packages listed from getting updated. To overcome this issue, there are two ways: 1. Run sudo apt-get . . . → Read More: The following packages have been kept back: Message in Ubuntu when updating packages

Overcoming GConf error: Failed to contact configuration server

If you get the following error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details – 1: Server ping error: IDL:omg.org/CORBA/COMM_FAILURE:1.0) you can try resolving it by doing:

$ mv . . . → Read More: Overcoming GConf error: Failed to contact configuration server

Open a terminal window in Linux

To Open up a terminal window on your Linux computer, press Alt+F2 to pull up the following window. You will see a terminal window. At the $ prompt, you can type any commands. This is also called the command line in Linux.

May 2017
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