UBUNTU GUEST SESSION DISABLE


In case your laptop is never used by anobody else, then I see no use of Guest Session. Guest session is only necessary if you let other people to share your laptop. In my case I never let anyone to use my laptop, hence for me my user account is enough. So I removed the gurst session from my device.In order to remove the guest session, do following things in your terminal:
  • First open your terminal:  CTRL+ALT+T
  • Then type: sudo gedit /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
  • In your text editor simply add this line of code allow-guest=false
Now save your configuration file, Close it and restart, this is what you will see:





Troubleshoot Network Manager, Apache, Wireless...

Today's Blog is all about networking stuffs and I will be covering following points:
  1. Know your Network Controller Device with lspci
  2. Display all interfaces which are currently available, even if down with ifconfig
  3. Enable the service networking 
  4. Enable Apache server
  5. Then Enable Network Manager with network-manager
  6. Then  Enable your WiFi with nmcli nm

AND REMEMBER ALL THESE THINGS WILL BE DONE WITH OUR TERMINAL THIS IS WHY LINUX IS SO COOL...


Then we are all set to run the internet.And now we are some basic troubleshooter about networking, though networking is a huge this would be the first step. Not actually first first step in networking is always theory The Basics of Networking, but we are not dealing with it today. So lets begin

1. In order to know  the hardware devices assembled in your laptop open your TERMINAL CTRL+ALT+T and then type lspci .
This displays all the hardware devices  like PCI BRIDGE, SATA controller, SMBus, USB Controller, Audio Device assembled in your laptop / computer. 



My Network controller is:
02:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)

2. So now we need to know the interfaces that are available in our UBUNTU.  To see this type ifconfig in the terminal and you will see the output like this :

3. To access the internet first your hardware device should be activated, In order to do so type 
sudo service networking  and press tab twice which displays  arguments like:
 force-reload       reload        restart       start         stop
Perform any you need.

4.  To enable apache server in terminal type:

      sudo service apache2 start

5.  Now enable the network manager. In order to do so in terminal type:
    
     sudo service network-manager start 

6. Now First view the available connecting points Wireless point or Ethernet. To view the available wifi points in terminal type
    
     sudo nmcli con list



This displays the available devices With its UID and SSID.
Now to enable the wifi in terminal type:

      Sudo nmcli con up SSID or the UID

You can manipulate these basic networking commands and  triubleshoot on your own.

UBUNTU DESKTOP WALLPAPER TWEAKS

Can you Set a picture of yours as default Ubuntu Desktop Wallpaper?

Well, setting a picture of yours as a wallpaper is totally different then setting default images as wallpaper.That picture of yours after it is deleted or moved in another location, your wallpaper either gets blank or some default images are set as wallpaper.

So in order to set your image as default image you should  work on following steps:
I have tried this tweak  on both 12.04 LTS and 14.04LTS and it works absolutely fine.
  1. First copy your image to /usr/share/backgrounds/ Do this from terminal using root prompt or do it from Nautilus  typing nautilus in terminal, so that you will not face permission denial.
  2. Edit  the XML file /usr/share/backgrounds/contents/trusty.xml and paste this code:
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format which is both human-readable and machine-readable. It is defined by the W3C's XML 1.0 Specification[2] and by several other related specifications,[3] all of which are free open standards.[4]  (Definition referenced from Wkipedia)

<static>
    <duration>1795.0</duration>
    <file>/usr/share/backgrounds/Aurora_500PX.jpg</file>
  </static>
  <transition>
    <duration>5.0</duration>
    <from>/usr/share/backgrounds/Aurora_500PX.jpg</from>
    <to>/usr/share/backgrounds/Reflections_by_Trenton_Fox.jpg</to>
  </transition>

Instead of Aurora_500PX.jpg keep your filename.

     3. Edit file /usr/share/gnome-background-properties/trusty-wallpapers.xml

<wallpaper>
    <name>AURORA 500PX</name>
    <filename>/usr/share/backgrounds/Aurora_500PX.jpg</filename>
    <options>zoom</options>
    <pcolor>#000000</pcolor>
    <scolor>#000000</scolor>
    <shade_type>solid</shade_type>
  </wallpaper>

Edit your filename instead of Aurora_500PX.jpg




Default Ubuntu Wallpapers

Look there are fourteen default wallpapers in Ubuntu. Our purpose is to set our image in that list so that next time we won't have any problem even we lose the picture or move it to another location. 


You can see the image selected with red rectangle and its thumbnail inside the monitor on your left which is the AURORA Borealis  downloaded from 500PX.com
And you can even see I have messed up with images duplication.


Troubleshoot your dead screen in Ubuntu with LightDM.

Troubleshoot your dead screen in Ubuntu with LightDM.

This works great in times when you lose your user interface and reach a dead end.In order to troubleshoot your black screen you need to go through following steps:

  1. Open a Virtual Console
virtual console (VC) – also known as a virtual terminal (VT) – is a conceptual combination of the keyboard and display for a computer user interface. It is a feature of some operating systems such as BSDLinux, and UnixWare in which the system console of the computer can be used to switch between multiple virtual consoles to access unrelated user interfaces. Virtual consoles date back at least to Xenix in the 1980s. 
The Keyboard Combination to open Virtual Terminal is CTRL + ALT + F1. You can even use F2 to F6, but remember F7 is your recent console.

       2. Run LightDM from terminal

LightDM is an X display manager that aims to be lightweight, fast, extensible and multidesktop. It uses various front-ends to draw login interfaces, so-called Greeters. 

I understand that lightdm is the display manager like explorer.exe manages window's display. So a dead screen appears means your lightdm is off.Run it typing: 
sudo lightdm start in your terminal and you are into your interface.

NOTE: Definitions are referenced from wikipedia
HOW TO SPEED UP UBUNTU?

HOW TO SPEED UP UBUNTU?

My 'UBUNTU 14.04' takes too much time after first boot. Well genius people will have many tricks and tweaks to speed up their systems but as a beginner  I am researching in the internet about following things which can possibly boost up performance of Ubuntu:
  1. Packages / Software installed in my #Ubuntu.
  2. Distinguishing useful / obsolete software.
  3. Removing unnecessary software, Releasing space, which can increase the speed.
This could be one way of solving the problem of slow performance of speed.

Today I will show  some ways to see the packages  and software installed in Ubuntu.

  1. Synaptic Package Manager

To open the Synaptic Package Manager in terminal type:

[email protected]:~$ sudo synaptic

This will open the GUI of Synaptic Manager. From there you can explore the installed packages.

    2. dpkg --get-selections

To get a list of packages installed locally do this in your terminal:

[email protected]:~$ sudo dpkg --get-selections | grep -v deinstall

To save that list to a text file called packages on your desktop do this in your terminal:

[email protected]:~$ dpkg --get-selections | grep -v deinstall > ~/Desktop/packages

     3.  aptitute

To get just the packages which were expressly installed (not just installed as dependencies), you can run

[email protected]:~$ aptitude search '~i!~M'

This will also include a brief description, which you may want. If not, use the option -F '%p'


     4. Create Backup

Create a backup of what packages are currently installed:

[email protected]:~$ dpkg --get-selections > list.txt

Then (on another system) restore installations from that list:

[email protected]:~$ dpkg --clear-selections

[email protected]:~$ sudo dpkg --set-selections < list.txt

To get rid of stale packages

[email protected]:~$ sudo apt-get autoremove

To get installed like at backup time (i.e. to install packages set by dpkg --set-selections)

[email protected]:~$ sudo apt-get dselect-upgrade

There are many documentations available in the internet and I searched only few intelligent peoples'  brain. There are many users out there with creative ideas to manipulate terminals and  bash scripts. it can by you as well.

So now I know to list out all the packages and save them in txt file. Next time I will show some methods to remove the old and obsolete packages. In a few blogs we will be able to maintain the speed of our OS i.e. UBUNTU

See you guys soon.