Header V3 DSA signature: NOKEY, key ID 37017186

To resolve this key problem in RHEL, I installed the public release key

#rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

This allows you to install from the local source.Copy and install all the packages from the RHEL5 DVD’s to a directory to use ‘YUM’ from local repository.

Importing the key as outlined above enabled me to install the packages without getting the following error:

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 37017186.

Note : RHEL DVD’s help me in completing the installation in local server without internet connection.

Slicer – Visualization and image analysis software package

Slicer, or 3D Slicer, is a free, open source software package for visualization and image analysis. 3D Slicer is natively designed to be available on multiple platforms, including Windows, Linux and Mac Os X.

Feature Highlights

Slicer 3.6, is the official release as of June 2010

Features include

• Improved Interactive Editor
• New Color Module
• Improved Volume Rendering
• EM Segmenter, simple version
• Fast Marching Segmentation
• Robust Statistics Segmentation
• New Registration module
• New Slices module
• Fiducial based tractography
• Improved SceneSnapshot Screen Capture functionality
• 4D Image Viewer
• Compare View and Cross Hairs
• Support for Extension Server for installing plug-ins
• Improved Dicom Support
• MRML scenes and all data load from and save into XNAT desktop

You may download different versions of Slicer3 and find pointers to the source code, mailing lists and bug tracker. Please note that Slicer continues to be a research package and is not intended for clinical use. Testing of functionality is an ongoing activity with high priority, however, some features of Slicer3 are not fully tested.

Thanks to Slicer – Click here for more info

Install Compiz & Compiz Fusion plugins on Ubuntu 10.04

It is very easy and simple to install Compiz & Compiz Fusion plugins on Lucid Lynx.

Just Click Application —> then Ubuntu Software Center

Ubuntu Software Center pop up

Search for CCSM

Click install and then give the root password to install CCSM

Installation Progress

After the CCSM installation completed, install Nvidia drivers

Click System –> Administration –> Hardware Drivers

Then the system searched for available drivers and i choosed the recommended Nvidia accelerated graphics driver (version 173) option from the list and then activated the driver by clicking Activate button.

Restart the system, so that the new nVidia graphic display driver will be ready for use.

Then enabled the desktop effects by clicking System –> Preferences –> Appearance and on the –> Visual Effects tab, selected Normal .

After this installation my desktop looks great, very much happy to use Desktop effects in Ubuntu 10.04.

After reading this you too will be enjoy using  Compiz & Compiz Fusion plugins in Ubuntu 10.04 (Lucid Lynx).

How to move the Minimise, Maximise and Close buttons Back to the Right in Ubuntu 10.04 ?

After I install Ubuntu 10.04 , I found the new default theme has the Minimise, Maximise and Close buttons have been moved from the top right, to the top left.

It is very difficult for me to use these buttons on the left.

Now, How do I move the Minimise, Maximise and Close buttons Back to the Right  ?
 
To move now Press Alt+F2 , enter “gconf-editor” in the text field, and click on Run.

The Configuration Editor should pop up.

Click on the + button next to the “apps” folder, then Click “metacity” in the list of folders and then click on the “general” folder.

Double-click button_layout to edit it on the right side .

Change the text in the Value text field to:

    menu:minimize,maximize,close

Click OK and the change will occur immediately.

Now you will see the Minimise, Maximise and Close buttons have been moved to top right.

Now it is really good see the buttons back to top right, and after reading this you too feelto move the Minimise, Maximise and Close buttons back to the Right in Ubuntu 10.04 .

How do install GIMP in Ubuntu 10.04 ?

It is very simple.

Click Application –> Ubuntu Software Center –> Get software

Then Search for GIMP

Click install to install gimp.

( or )

Open a terminal

Go to root login prompt

verman@verman-desktop:~$ sudo -i

type apt-get install gimp

root@verman-desktop:~# apt-get install gimp
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following extra packages will be installed:
gimp-data libbabl-0.0-0 libgegl-0.0-0 libgimp2.0 libmng1
Suggested packages:
gimp-help-en gimp-help libgimp-perl gimp-data-extras
The following NEW packages will be installed:
gimp gimp-data libbabl-0.0-0 libgegl-0.0-0 libgimp2.0 libmng1
0 upgraded, 6 newly installed, 0 to remove and 156 not upgraded.
Need to get 7,598kB of archives.
After this operation, 54.2MB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Get:1 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/main libgimp2.0 2.6.8-2ubuntu1.1 [594kB]
Get:2 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/main gimp-data 2.6.8-2ubuntu1.1 [1,981kB]
Get:3 http://in.archive.ubuntu.com/ubuntu/ lucid/main libbabl-0.0-0 0.0.22-1build1 [72.2kB]
Get:4 http://in.archive.ubuntu.com/ubuntu/ lucid/main libgegl-0.0-0 0.0.22-0ubuntu4 [329kB]
Get:5 http://in.archive.ubuntu.com/ubuntu/ lucid/main libmng1 1.0.9-1ubuntu1 [209kB]
Get:6 http://in.archive.ubuntu.com/ubuntu/ lucid-updates/main gimp 2.6.8-2ubuntu1.1 [4,413kB]
Fetched 7,598kB in 24s (305kB/s)
Selecting previously deselected package libgimp2.0.
(Reading database … 122714 files and directories currently installed.)
Unpacking libgimp2.0 (from …/libgimp2.0_2.6.8-2ubuntu1.1_i386.deb) …
Selecting previously deselected package gimp-data.
Unpacking gimp-data (from …/gimp-data_2.6.8-2ubuntu1.1_all.deb) …
Selecting previously deselected package libbabl-0.0-0.
Unpacking libbabl-0.0-0 (from …/libbabl-0.0-0_0.0.22-1build1_i386.deb) …
Selecting previously deselected package libgegl-0.0-0.
Unpacking libgegl-0.0-0 (from …/libgegl-0.0-0_0.0.22-0ubuntu4_i386.deb) …
Selecting previously deselected package libmng1.
Unpacking libmng1 (from …/libmng1_1.0.9-1ubuntu1_i386.deb) …
Selecting previously deselected package gimp.
Unpacking gimp (from …/gimp_2.6.8-2ubuntu1.1_i386.deb) …
Processing triggers for hicolor-icon-theme …
Processing triggers for man-db …
Processing triggers for desktop-file-utils …
Processing triggers for python-gmenu …
Rebuilding /usr/share/applications/desktop.en_IN.cache…
Processing triggers for python-support …
Setting up libgimp2.0 (2.6.8-2ubuntu1.1) …

Setting up gimp-data (2.6.8-2ubuntu1.1) …
Setting up libbabl-0.0-0 (0.0.22-1build1) …

Setting up libgegl-0.0-0 (0.0.22-0ubuntu4) …

Setting up libmng1 (1.0.9-1ubuntu1) …

Setting up gimp (2.6.8-2ubuntu1.1) …

Processing triggers for libc-bin …
ldconfig deferred processing now taking place
root@verman-desktop:~#

Now gimp installed in my PC and it works fine.

I Love GIMP.

Unable to update Ubuntu 10.04 using proxy connection – “No address associated with hostname”

I decided to install Ubuntu 10.04 (Lucid Lynx) in PC today and the outlook looks good. I was very much surprised that “GIMP” was missing in this release and then I tried to update Lucid Lynx.

verman@verman-desktop:~$ sudo apt-get update
[sudo] password for verman:

Err http://security.ubuntu.com lucid-security Release.gpg
Something wicked happened resolving ‘security.ubuntu.com:http’ (-5 – No address associated with hostname)
Err http://security.ubuntu.com/ubuntu/ lucid-security/main Translation-en_IN
Something wicked happened resolving ‘security.ubuntu.com:http’ (-5 – No address associated with hostname)
————-
————-
————-
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/lucid-updates/multiverse/source/Sources.gz  Something wicked happened resolving ‘in.archive.ubuntu.com:http’ (-5 – No address associated with hostname)

E: Some index files failed to download, they have been ignored, or old ones used instead.

This Showed me a error “No address associated with hostname” in all the line.

Then I tried all the possibility to update  Lucid Lynx.

I was using Proxy Internet connect and  I didn’t touch any settings.

Proxy is working fine and able to browse all website in the Internet.

Then suspect it has nothing to do with proxy .

Even when i manually exported  HTTP proxy: http://myname:mypassword@proxy Port: 8080 , apt-get update was not working.

After a long search using my friend google, I found that we had to acquire http proxy in apt.conf file

Then I just added a line in /etc/apt/apt.conf

Acquire::http::Proxy “http://myname:mypassword@proxy:8080″;

after that it worked charm!

verman@verman-desktop:~$ sudo apt-get update
[sudo] password for verman:
Hit http://in.archive.ubuntu.com lucid Release.gpg
Ign http://in.archive.ubuntu.com/ubuntu/ lucid/main Translation-en_IN

————-
————-
————-
Hit http://security.ubuntu.com lucid-security/multiverse Packages
Hit http://security.ubuntu.com lucid-security/multiverse Sources
Reading package lists… Done
verman@verman-desktop:~$

Thanks to Google ……….

Now I will try installing “GIMP”

Ubuntu 10.04 Lucid Lynx is officially being released

As many of you will know, Ubuntu 10.04 Lucid Lynx is officially being
released today – perhaps has already been released as I am writing this.
Ubuntu 10.04 is an Long Term Support (LTS) version. With the Long Term
Support (LTS) version you get 3 years support on Ubuntu Desktop, and 5 years on Ubuntu
Server.

Let’s get a bird’s eye view of what is on offer in this latest avatar
namely  Ubuntu 10.04 a.k.a Lucid Lynx.

Fig: Ubuntu Lucid Lynx Desktop sporting a new look

New Features in Ubuntu 10.04

User Interface Design

1. Ubuntu 10.04 sports brand new themes – Ambiance and Radiance.
2. The Window  minimize, maximize and close buttons have been shifted
   to the left.
3. New Logos – Ubuntu 10.04 sports redesigned, aesthetically pleasing
   logos that reflect the precision and engineering that sits at the heart
   of the product.
4. Icons, start up and login screens, and desktop backgrounds that are
   brand new.

A Redesigned Installer

Ubuntu 10.04 sports a far more user friendly installer. The installer now provides feedback on password strength and the option to encrypt the
user’s home directory.

Improved Startup Speed

With version 10.04, Ubuntu has moved to a new boot system called Plymouth.

Plymouth is an application that runs very early in the boot process (even before the root file system is mounted!) that provides a graphical boot animation while the boot process happens in the background. Ideally, the goal is to get rid of all flicker during startup.

This new system makes Ubuntu boot much faster.

Applications – New and Improved ones

1. Simple Scan – An application that makes scanning documents quite simple.
2. PiTiVi Movie Editor
3. Gwiber – A microblogging client with support for Twitter, Identi.ca, StatusNet, Facebook, Flickr, Digg, FriendFeed, and Qaiku.
4. Me Menu – A menu that resides in the top panel of your GNOME desktop and which provides one click access to all your social networking and chat accounts.
5. Empathy – The default chat application sports new features one of them being support for Facebook chat.
6. Nautilus – The default file manager, it has seen many minor enhancements, the most prominent being a split view mode which allows you to display the contents of two different folders within the same window.

However, GIMP is out of the default list of installed applications. No one is stopping you from installing it separately though.

iPhone and iPod Touch Support

Ubuntu Lucid Lynx (10.04) comes with limited support for iPhone and iPod
Touch devices which is a good thing for the owners of these Apple products.

Now you can browse the contents of your iPhone and even play music residing on these devices from Ubuntu.

Ubuntu One – Cloud Storage

Ubuntu One – Cannonical’s cloud storage service is seamlessly integrated in Ubuntu 10.04.  Some of the integration features are listed below.

• Sync any folder in your Home folder between computers.
• Easily publish files online to share with others.
• Synchronize your Firefox bookmarks to be available on multiple
  computers.
• Synchronize your contacts residing in Evolution email client.
• If you’re a paying Ubuntu One subscriber, you can now sync your mobile phone contacts with Ubuntu One too.

Ubuntu One Music Store

Buy DRM free music singles from the Ubuntu One Music store.

Ubuntu Software Center

Ubuntu Software Center allows you to install and manage your installed
applications. In Ubuntu Lucid Lynx, it has seen lots of user friendly enhancements and has received a nice graphical overhaul.

Impressed already ? Then download Ubuntu 10.04 a.k.a Ubuntu Lucid Lynx
from the official Ubuntu website.

Thanks to Linuxhelp.blogspot.com

Open Source Video Conferencing

Open Source Video Conferencing software are pretty new. Except the grand father Ekiga (former GnomeMeeting), the most promising Open Source

Video Conferencing solutions have less than 2 years on the market.DimDim and Vmukti are the gorilla of the field, with aggressive features list.Open Source Video Conferencing software are pretty new.

Except the grand father Openmeetings (former GnomeMeeting), the most promising Open Source Video Conferencing solutions have less than 2 years on the market.DimDim and Vmukti are the gorilla of the field, with aggressive features list.

Leading Open Source Video Conferencing solutions

Dimdim Open Source

Dimdim is an open source web meeting product with features like Application, Desktop and Presentation sharing with audio and video conferencing and chat. No attendee installation – all features are available through a web
browser. Dimdim can be integrated with Moodle.

Ekiga

Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many audio and video codecs, and is interoperable with other SIP compliant software and also with Microsoft NetMeeting.

Other Open Source Video Conferencing solutions

VMukti

VMUKTI is Social, Web 2.0, SaaS, Peer-to-peer, & VoIP Open Source multi-Party Conferencing (like video and web conferencing WebEx) Broadcasting , Collaboration And CMS platform for Web & Mobile users Video/ Audio/ Presence &
Content.

Openmeetings

Multi-Language Cross-Platform Customizable Video-Conferencing and Collaboration

WengoPhone

WengoPhone allows you to make PC to PC video and voice calls, and to integrate all your IM contacts in one place. Please note that WengoPhone do not integrate yet Video Conferencing.

Article taken : opensource-it

Mozilla Labs and Open Innovation — Calling Students, Schools and Universities

“Laboratories are
where science and creativity meet to develop, research, and explore new
ideas. Mozilla Labs embraces this great tradition — a virtual lab where
people come together to create, experiment, and play with new Web
innovations and technologies.

Everything is
possible here. Crazy ideas and sparks are encouraged as together we
explore and experiment with brand new ideas in whole new ways. Mozilla
Labs is about spurring and harnessing the intelligence, wisdom, and
energy of the Mozilla community for the greater good of the Web. Let’s
imagine the future of the Web, and then let’s build it together.”

Together through Mozilla Labs we have collectively explored thousands
of ideas, mocked up concepts, built prototypes and launched products.
We built programs to encourage participation from designers, worked with
dozen of universities and ran Design Challenges
with thousand of entries from all over the world.

collaborated
directly with universities in the US, Brazil and Australia to integrate
Design Challenges into the curriculum – ranging from week-long
workshops to courses designed around the challenge. Over the course of
the program Mozilla Labs staff provided feedback and an open forum for
students to collaborate, explore and learn.

In the next few months, we plan on rolling out new tools to aid
better discussion and collaboration on ideas, run a series of regular
“spotlights”, where we present and discuss new and exciting concepts. We
want to work directly with students, schools and universities to
explore innovation on and for the Web.

Get involved

Article taken from mozillalabs.com

What’s the difference between a Hub, a Switch and a Router?

Hubs, switches, and routers are all devices that let you connect from one computers to other computers, networked devices, or to other networks.

Each has two or more connectors called ports into which you plug in the cables to make the connection.

Hub :
A hub is a small, simple, inexpensive device that joins multiple computers together. Its job is very simple: anything that comes in one port is sent out to the others. That’s it. This is quick and easy ways to connect computers in small networks.

Hubs operate using a broadcast model

Switch :
A switch is a small hardware device that joins multiple computers together within one local area network (LAN). a switch generally contains more intelligence and a slightly higher price than a hub. switches are capable of inspecting data packets as they are received, determining the source and destination device of each packet, and forwarding them appropriately. For example, if it sees traffic from machine A coming in on port 2, it now knows that machine A is connected to that port and that traffic to machine A needs to only be sent to that port and not any of the others.

switches operate using a virtual circuit model.Switching involves moving packets between devices on the same network.Switches operate at layer 2 of the OSI Model.

A switch is able to determine where a packet should be sent by examining the MAC address within the data link header of the packet (the MAC address is the hardware address of a network adapter). A switch maintains a database of MAC addresses and what port they are connected to.

Router :
A router is a small hardware device that joins multiple networks together. These networks can include wired or wireless home networks, and the Internet.A simple way to think of a router is as a computer that can be programmed to understand, possibly manipulate, and route the data its being asked to handle.

Routing involves moving packets between different networks. Routers, on the other hand, operate at layer 3 of the OSI Model.

A router is able to determine where to send a packet using the Network ID within the Network layer header. It then uses the routing table to determine the route to the destination host.