Fixing issue with Ubuntu default unity theme (no GUI - only wallpaper / desktop)

Hi,


Don't be panic if you are not able to see taskbar/panel/..etc after login.


Today I have tried to configure my machine's UI using compizConfigSettingsManager, sudden of GUI mode gone.

I googled it, after doing so many researches, I have found a fix as below,

(My machine was showing login window, but no GUI after login)

Step1) After successful login, right click on the desktop and select "open terminal" then go to your account's home directory.

Step2) List out all system/hidden files using "ls -la", then delete folder which ever starts with ".compiz or compiz*"

- Use sudo if it is not happened.

 * I have removed two folders in my home directory named as ".compiz" & ".config/compiz-1".

Step3) Restart Unity (default unity theme from ubuntu) after deleting above folders by using below commad or vice-versa.

 - setsid unity


Thats all, Immediately you will get GUI. Better you reboot the machine using "sudo reboot" from terminal.

:)

Fixing issue with Realtek Wifi on Ubuntu 14.X - Lenovo L440

Hi,


Today I have installed Ubuntu in my machine Lenovo L440, But there was no driver found for wifi since it has latest wifi driver which supports only for Windows.


After searching in the internet I have found a solution as below.



Steps:
-------

- Type the command 'lspci' in terminal. You will see the information of wifi hardware information as below.

02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8192EE PCIe Wireless Network Adapter

- I have tried below links to install some unstable versions of driver software.

http://netbook-remix.archive.canonical.com/updates/pool/public/o/oem-wireless-rtl-92ce-92se-92de-8723ae-88ee-8723be-92ee-dkms/

http://netbook-remix.archive.canonical.com/updates/pool/public/o/oem-wireless-rtl8192ee-trusty-dkms/

Note: After installation, it may not work immediately. 

sources : 

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1239578

http://ubuntuforums.org/showthread.php?t=1457592&page=7

How to install Graphviz in Ubuntu 14.X

Hi,

Graphviz is a tool to generate diagrams using plantuml (one of the tools depending on it).


Below are steps to install Graphviz tool in Ubuntu.


Step1) In the terminal type below command with sudo permission

sudo apt-get install graphviz

This command will automatically downloads and installs it.



If you want to take a binary copy of this setup, then run below command in terminal

sudo apt-get download graphviz

This command will download a copy of the setup (*.deb) into current directory. You can keep it as backup ;)



Source: http://askubuntu.com/questions/196230/how-do-i-install-graphviz-2-29-in-12-04

Cat command usage

Hi,

Here I will show you how to use cat command in some of the areas to utilize from command line (CLI).

1) If you want to display the content of a file in the terminal, then use as below.

Syntax : $>cat <filename>

$> cat samplefile.text
Hello how are you

2) If you want to create a new file with some text in it.

Syntax: $> cat > new-filename

$>cat > hellofile.text
Hi hello how are you

To save the file, use Ctrl+c

3) If you want to append some text to an already existing file.

$> cat >> oldfilename.text
Hi this is last line

To save the file/ append the text, use Ctrl+c

To be continued.....