Show Desktop key (Alt+Control+d) is not working in Ubuntu Linux!!

Open CompizConfig Setting Manager from Ubuntu dashboard, and navigate to Key bindings  tab of General options, as shown below:

Find Show Desktop setting. It may be disabled or bounded to some keys-combination.

To set it to keys-combination of  your choice: click the Disable button: an Edit Show Desktop windows  will pop-up:

You can, select Grab key combination, and type your keys-combination. you can use default: Control Alt d. CompizConfig Setting Manager will show it as <Primary><Alt>d

Now you can toggle to Desktop by pressing keys-combination Control Alt d

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Installation of ASP.NET MVC 3: Error 0x80070643 installing ASP.NET MVC 3 / MVC 3 setup fails

While Installing MVC3 for VS2010, it gives installation did not succeed message and the logs show this error:

Here goes the solution.

  1. Uninstall old version of Asp net web pages from you system.
  2. Run the install (even though it fails) but leave it open on the screen at the end that says “Installation Did Not Succeed” (This is very important!)
  3. Now you need to track down the temp files for the installer it should be in a folder D:/Temp/ext46220 (see the above error message screen shot it will give you the folder location)
  4. Make a copy of this entire folder because finishing the installer will delete it.
  5. Now that you have all the install files you just need to run the installers for the different components (to double check what they were you can open the log from the installer and see which msi’s it ran)
  6. So install AspNetWebPagesVS2010Tools.msi then AspNetMVC3VS2010Tools.msi form the copied folder.

This should work but after doing this when I was build a MVC3 application it gave errors sunc as missing reference for System.Web.MVC.dll and some Microsoft Web Helper DLLs for this I did following.


Since MVC3 has done major changes in this release as compared to MVC2 so you need to download ASP.NET MVC 3 Beta and NuPack.  download and install them using the Microsoft Web Platform Installer.

Ubuntu Linux: Network configuration from command Line! Setting IP address, default gateways, and DNS servers for accessing Internet/network on a LAN.

Here is an easy sample for configuring Network Settings in Ubuntu Linux:

 Assumptions: You want to set IP address of your system as 10.1.1.8 at eth0 interface (ethernet or LAN, RJ-45 Cable port), with default gateway as 10.1.1.1 and DNS servers as 208.67.220.220 and 208.67.222.222.

  • To check existing network settings

$ ifconfig -a

  • Setting IP address and netmask:

    To activate network interface eth0 with IP address ( 10.1.1.8 ) and netmask (255.255.255.0):

$ sudo ifconfig eth0 10.1.1.8 netmask 255.255.255.0 

Shutting down eth0:
sudo ifconfig eth0 down

         Bring up eth0:
sudo ifconfig eth0 up

  • To see the existing routing table

$ route –n

  • Setting default gateway(10.1.1.1)

$ sudo route add default gw 10.1.1.1

  • Setting DNS servers

Open the file: /etc/resolv.conf

$ sudo vi /etc/resolv.conf

Write DNS Servers:

nameserver 208.67.220.220

nameserver 208.67.222.222

Test:

ping technologydwell.com

Some Password-Change related issues in ubuntu linux.Tested solutions.

Here are some Password-Change related issues in ubuntu linux and their tested solutions:

1.”Authentication token manipulation error“, while trying to change a Ubuntu user’s password:

Possible resaon for this error is that the filesystem night be mounted as read only.  To fix it, simply type:

    mount -o remount,rw /

2. While using sudo passwd command, it gives “password changed successfully” message., but in reality still taking the same old password, and denying the new password:

 To solve this problem, first explicitly switch to the user account whose password you want to change.

     sudo su youusername

 Tip: you may use sudo whoami command to find the current user.

 now try :

     sudo passwd

 Should work.

Unable to switch application-windows using Alt+Tab keys in Ubuntu Linux!

If you are unable to switch application-windows such as terminal windows, gedit… using Alt+Tab keys in Ubuntu Linux, then you can try fix given below:

Go to   Dash Board > System Settings and select  Keyboard:

Select  Shortcuts tab and go to Navigation on left. Click on Switch applications setting and and set it to Alt+Tab:

Reboot the system.

If problem still persist, then you can try Compiz Config Settings Manager. To install  this, type:

sudo apt-get install compizconfig-settings-manager

 Open it from Ubuntu Dashboard:

Go to  Window Management and check Application Switcher and Static Application Switcher:

Reboot your system, then again try Alt-Tab, it should work!!!

Tip: Compiz Config Settings Manager can help in solving many shortcut-keys related problem. For example: If show Desktop key (Alt+Control+d) is not working in your Ubuntu Linux, then you can try following steps:

Open CompizConfig Setting Manager from Ubuntu dashboard, and navigate to Key bindings  tab of General options, as shown below:

Find Show Desktop setting. It may be disabled or bounded to some keys-combination.

To set it to keys-combination of  your choice: click the Disable button: an Edit Show Desktop windows  will pop-up:

You can, select Grab key combination, and type your keys-combination. you can use default: Control Alt d. CompizConfig Setting Manager will show it as <Primary><Alt>d

Now you can toggle to Desktop by pressing keys-combination Control Alt d


Google Chome & Chromium (Ubuntu Linux) Internet Browser: Automatically clear cache, history and other browsed data on exit. Important privacy settings.

To protect your privacy, you should make sure that Google Chrome (Windows) & Chromium (Linux) Internet Browser automatically deletes your browsing history, autofill form data, passwords, typed URLs, cookies, and other traces of online activities. Following settings may help:

1. Click the “Customize and control Chromium (or Chrome)”  icon at top-right of the browser and select “Settings”, as shown below:

2.  Navigate to Personal Stuff settings (Linux) or Advanced Settings (Windows):

Password Settings: select “Never save passwords”

Form Autofill setting: uncheck “Enable Autofill to fill out web forms in a single click.”



3.  Navigate to Under the Hood settings  (Linux) or Advanced Settings> Privacy (Windows):


The most important setting required for clearing cache, history and browsing data is:

 Privacy> Content Settings


Check the “Clear cookies and other site and plug-in data when I close my browser”.


Tip: Many websites such as Facebook, Twitter, Flickr, DropBox, Google etc. use encrypted HTTPS at the time of authentication/verification only, after then plain HTTP takes over to avoid performance issues. HTTPS can provide end-to-end encryption and security between the web-application and the web-server. To force HTTPS protocol on your Chome or Chromium browser, you can use Use HTTPS or HTTPS Everywhere extension. These applications search for HTTPS connections available on the  Web-sites and enforce the HTTPS end-to-end communication, if the HTTPS is not available, then they simply re-direct to  plain HTTP connections. Below are pictures of popular HTTPS enforcer applications:


Which is good image editor or graphics drawing tool for Linux? What is the Ubuntu equivalent of MS Paint?

 

There are several tools available for Image drawing or editing , graphics design: GIMP, xpaint, gpaint, kolourpaint, mtpaint..

 

GIMP or General Image Manipulation Program is one of the most popular and good graphics editor.

 

GIMP can do image editing tasks such as resizing, editing, cropping , converting between different image formats.

 

To instal on Ubuntu, open terminal and type command:

 

   $ sudo apt-get install gimp


Tip: If you are migrating from Windows to Linux then KolourPaint from http://www.kolourpaint.org/ may be a good choice.