sexta-feira, 23 de setembro de 2016

Ignorância Sobre a Própria Burrice

Com mais de uma década de pesquisa, David Dunning, um psicólogo da Universidade de Cornell, demonstrou que os seres humanos acham “intrinsecamente difícil ter uma noção do que não sabem”.

Se um indivíduo não tem competência em raciocínio lógico, inteligência emocional, humor ou mesmo habilidades de xadrez, a pessoa ainda tende a classificar suas habilidades naquela área como sendo acima da média.

Várias pesquisas psicológicas estão chegando à conclusão que a incompetência priva as pessoas da capacidade de reconhecer sua própria incompetência. Ou seja: as pessoas burras são burras demais para saber que são burras.

E essa desconexão pode ser responsável por muitos dos problemas da sociedade.


"A burrice no Brasil tem um passado glorioso e um futuro promissor." - citando: Roberto Campos

quinta-feira, 25 de agosto de 2016

How to prepare WD My Passport Ultra 1TB for Linux backup

I bought a WD My Passport Ultra 1TB for Windows because I was only able to find it or the MacOS version in the stores, because it had good reviews and good price < US$60

The cons is that it is not good for Linux backup out-of-the-box because NTFS does not preserve ExtFS ownership (user/group).

The second bad news is that gparted will not be able to resize the installed partition not even if you try to use Windows in virtualbox.  Actually with virtualbox it will not be able to mount the formated partition.

So you will need to use a system with Win 7 so you can use a Windows partitioning program (eg. Partition Programs) and than resize the factory installed NTFS "data" partition.

The new size should be, say, 24~34GB ( leave this space so you can exchange data with Windows (your friends or family) and to keep the special native features of WD native Windows stuff and avoid it from causing problems (or void your warranty).

You should now create the new Ext4 file system with the empty space, but also reformat the NTFS partition, because the native version is not correctly detected or mounted with ntfs-3g.

I choose the names for the partitions below to be easily identified.

At the end of the process you should have something like this:

1) WD_NTFS with about  32 GB
2) WD_EXT4 with about 968 GB

3) Also, does not show, but there is a hidden partition (like a CD-ROM) that WD stores the special crypto stuff and firmware copy (this is what my research found).


The lack of capability of gparted to handle this type of filesystem is really frustrating.  How can this be true with so many talented people in our GNU community ?

Also, I understand now that WD really ignores Linux users. This is a sad situation since most users I know and worked with, for several years, are all Linux users and we usually choose WD HDD, at home and at work.  But, from now on, I will start to choose new brands that support linux users (WD do you hear me now?!).  And you should too.

Proud Linux User.

segunda-feira, 2 de novembro de 2015

FERRAMENTAS LINUX: Aptik Backup dos seus temas, PPA e pacotes

Ao formatar uma máquina com o Ubuntu para instalar outra versão um dos seus maiores problemas é o de ter que reinstalar tudo novamente, há vários programas e scripts que se propõem a fazer isso, veja o opção do APTIK Backup
FERRAMENTAS LINUX: Aptik Backup dos seus temas, PPA e pacotes

quinta-feira, 16 de julho de 2015

How to update Oracle Java on Ubuntu - faster then PPA releases

It usually takes a few days for a PPA repository to update Oracle JAVA releases.

You can solve this (for Debian based Linux distros) by making packages using "java-package" a few times (for various architectures), then distributing them internally.

If you don't have it installed open a console and type:

sudo apt-get install java-package

The big plus side is that this method always works; no matter how crazy Oracle's web pages become. Oracle can no longer break my build or stop my work, specially when Internet-banking depends on it!

The downside is that it's a bit more work to set up initially.

STEP-BY-STEP (ie. as the old music goes...)

1. Download the tar.gz files manually using your browser (ie. thus "accepting" their terms)

2. Run at prompt command:
         make-jpkg <java-package-name-xxx.tar.gz>.
   this will create a file named: "oracle-javaX-jXX_X_XXX.deb"
   Note that you may get some messages during the make-jpkg, just ignore them.

3. Distribute it within your organization (or your family devices)

For distribution over the Internet, I suggest using a password protected apt repository or provide raw packages using symmetric encryption:

passphrase="Hard to crack string. Use /dev/urandom for inspiration."
gpg --batch --symmetric --force-mdc --passphrase-fd 0 \
   oracle-javaX-jXX_X_XXX.deb <<< "$passphrase"

Of course providing (unencrypted) .deb packages on the internet is probably a violation of your license agreement with Oracle, which states:

    ... Oracle grants you a ... license ... to reproduce and use internally the Software complete and unmodified for the sole purpose of running Programs"

On the receiving end, if you have a password protected apt repo, all you need to do is apt-get install it. If you have raw packages, download, decrypt and dpkg -i them.

Works like a charm!


sábado, 11 de julho de 2015

How to Increase RAM available to Raspberry Pi CPU or GPU

Raspberry Pi 2 has 1,024MB RAM that is partitioned between the CPU and the GPU. If the Pi is working as a headless server or the Pi desktop is being accessed via VNC (which doesn't utilize the GPU) the memory split between the two processors can be altered to assign more memory to the CPU for running applications.
  • Default GPU memory on Raspbian is set to 64MB and the minimum recommended to ensure proper operation is 16MB.
  • Pi Camera Module requires a minimum of 128MB RAM.
  • Kodi Media center requires a minimum of 256MB RAM for the GPU, to avoid choppy video playback.
To modify GPU memory to 256MB either:
  1. edit /boot/config.txt and set gpu_mem=256;
  2. run sudo raspi-config and select option 8 Advanced Options -> A3 Memory Split and modify value to 256
Save the change, reboot the Pi, and enjoy the CPU memory boost!

quinta-feira, 12 de fevereiro de 2015

Can't remote access lubuntu server with Vino but connection with ssh works.


Can't remote access lubuntu server with Vino but can ssh it.


You open a ssh tunnel (map remote 5900 port to local 12345 port) of remote lubuntu station (ex: at terminal client side to remote access lubuntu station.

Example to type at cmd prompt:
 ssh -L 12345:localhost:5900 user@

         note: change "user" and address ( with your own ID.

You open a second terminal window at client station to start vnc with cmd:
xvncviewer localhost:12345

Error msg client side:
xvncviewer: VNC server closed connection

Error msg server (the ssh terminal) side:
channel 3: open failed: connect failed: Connection refused


Vino-server not running


At cmd prompt type (remote server side):
export DISPLAY=:0.0

Error msg:
Connected to RFB server, using protocol version 3.7
Server did not offer supported security type


server encryption scheme not understood client side


At the remote lubuntu server side set encryption variable to false

cmd prompt type:
gsettings set org.gnome.Vino require-encyption false

domingo, 23 de novembro de 2014

How to install pt-br language interface on Libreoffice - Ubuntu

If you have installed Libreoffice on Ubuntu and would like to change the interface language to pt-br (brazilian portuguese) do this:

CTRL-ALT -T  to open a terminal

Then issue the following command:

sudo apt-get install libreoffice-l10n-pt-br