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• Get Hands On with Raspberry Pi via Free OS-Building Course

  - by Jason Fitzpatrick

  Cambridge University is now offering a free 12-segment course that will guide you through building an OS from scratch for the tiny Raspberry Pi development board–learn the ins and outs of basic OS design on the cheap. You’ll need a Raspberry Pi board, a computer running Windows, OS X, or Linux, and an SD card, as well as a small amount of free software. The 12-part tutorial starts you off with basic OS theory and then walks you through basic control of the board, graphics manipulation, and, finally, creating a command line interface for your new operating system. Hit up the link below to read more and check out the lessons. Baking Pi – Operating Systems Development HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks HTG Explains: Why Do Hard Drives Show the Wrong Capacity in Windows?

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• Network traffic monitoring for unexperienced users

  - by Eduardo Casteluci

  I'm a really unexperienced Ubuntu user and I'm having a hard time monitoring my network traffic. I just need to know what websites each one of the devices connected to my network are accessing. I've tried to use ntop, but I couldn't work around it. Is that possible? I mean, is it possible to know that kind of data only by specifing a local IP address? How can I do that? It's a security issue that I'm facing and I need to work that "easy" monitoring out. Thanks

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• How to move Objects smoothly like swimming arround

  - by philipp

  I have a Box2D project that is about to create a view where the user looks from the Sky onto Water. Or perhaps on a bathtub filled with water or something like this. The Object which holds the fluid actually does not matter, what matters is the movement of the bodies, because they should move like drops of grease on a soup, or wood on water, I can even imagine the the fluid is mercurial, extreme heavy and "lazy". How can I manipulate the bodies (every frame or time by time) to make them move like this? I started with randomly manipulation their linear velocity, but I turned out that this not very smooth and looks quite hard. Is it a better idea to check their velocity and apply impulses? Is there any example? Greetings philipp

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• Is there really Object-relational impedance mismatch?

  - by user52763

  It is always stated that it is hard to store applications objects in relational databases - the object-relational impedance mismatch - and that is why Document databases are better. However, is there really an impedance mismatch? And object has a key (albeit it may be hidden away by the runtime as a pointer to memory), a set of values, and foreign keys to other objects. Objects are as much made up of tables as it is a document. Neither really fit. I can see a use for databases to model the data into specific shapes for scenarios in the application - e.g. to speed up database lookup and avoid joins, etc., but won't it be better to keep the data as normalized as possible at the core, and transform as required?

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• What's the best way to create animations when doing Android development?

  - by Adam Smith

  I'm trying to create my first Android game and I'm currently trying to figure out (with someone that will do the drawings and another programmer) what the best way to create animation is. (Animations such as a character moving, etc.) At first, the designer said that she could draw objects/characters and animate them with flash so she didn't have to draw every single frame of an action. The other programmer and I don't know Flash too much so I suggested extracting all the images from the Flash animation and making them appear one after the other when the animation is to start. He said that would end up taking too much resource on the CPU and I tend to agree, but I don't really see how we're supposed to make smooth animations without it being too hard on the hardware and, if possible, not have the designer draw every single frame on Adobe Illustrator. Can an experienced Android game developper help me balance this out so we can move on to other parts of the game as I have no idea what the best way to create animations is.

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• How to remove all LVs VGs and Partitions On All Drives Before Installing 12.04

  - by Mark

  I have 2 hard drives that had been used for Ubuntu Server 11.10. Now I would like to start from scratch with 12.04 but I'm having some trouble with the existing logical volumes and volume groups. Erasing data during install looks like it's going to take days. Is there a quick and simple way to wipe out all volumes/groups/partitions so I can start with 2 empty drives? When I set this up on 11.04 it took me a while to learn how to do it and I've since forgotten most of what I learned. For what it's worth, I'm only using this box to try and learn about Linux. Thanks in advance, Mark

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• Error installation of Ubuntu 12.04 LTS

  - by garu

  Attempting a new installation of Ubuntu 12.04 LTS on what was a dual boot Windows 7 and Ubuntu 12.04 LTS laptop ( Sony intel i3 core 64 bit with 500GB HDD). I followed the following procedure Install Ubuntu • has at least 4.4 GB available, is connected to the internet, download updates while installing and install this third-party are all ticked this time • I chose the Erase disk and install Ubuntu option ( since I want to have only Ubuntu 12.04 LTS operating system in my disk) Now shows The entire disk will be used • 501GB free disk I clicked the install now button. All data copied to the hard drive ( it was copied OK), askes for location, keyboared layout, and who are you. Started to install the Ubuntu 12.04 operating system. After some minutes, I got a report Installation failed, the installer encountered an unrecoverable error. A desktop session will now be run so that you may investigate the problem or try installing again. So, Please give me simple advice on how to proceed. Thank you

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• A rather long question about installation/uninstall

  - by user2364312

  Ok so here's the deal guys, last week I decided I want to install Ubunutu again because I really missed it. (Last time I had an ubunutu was 7.somehting) I downloaded 12.04 and isntalled it via bootable usb device. Knowing how dual boots works I cleared up some space on my hard disc before hand using the windows 7 built in disc manager. During Ubunutu's installation I thought that by choosing "Install Ubuntu alongside Windows 7" will automatically just use the space I cleared before, but apperentaly it did not since that partition is still 100% free space. On what partition is Ubunutu installed when using that method? And how can I uninstall it to re-install it back on the space I cleared up for it? Thank you very your time reading and helping!

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• What is the relationship between the business logic layer and the data access layer?

  - by Matt Fenwick

  I'm working on an MVC-ish app (I'm not very experienced with MVC, hence the "-ish"). My model and data access layer are hard to test because they're very tightly coupled, so I'm trying to uncouple them. What is the nature of the relationship between them? Should just the model know about the DAL? Should just the DAL know about the model? Or should both the model and the DAL be listeners of the other? In my specific case, it's: a web application the model is client-side (javascript) the data is accessed from the back-end using Ajax persistence/back-end is currently PHP/MySQL, but may have to switch to Python/GoogleDataStore on the GAE

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• Why my site not linking with google.com?

  - by nishant

  i am very tired about my website ranking in google. i am dong hard work about it but not getting anywhere my site in google. actually i am web master of a www.panbeli.in matrimony website INDIA. i am trying to improve its visibility in google last 5 month but not getting any positive result. but other search engine giving good result like yahoo and bing but google showing no any result in top 20 page result. my website is www.panbeli.in and my keyword are- bari samaj bari matrimony bari community bari shadi panbeli please help me if you can, b'coz i am very frustrated about it. my domain age is 4 years when i type link:panbeli.in in google search does not appear any pages from my site in google. whats the meaning is that?my site does not indexed in google?

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• front usb wont mount harddrives, internal usb ports do

  - by Thesgsuser

  I have noticed something in my new build, i am using Ubuntu desktop newest version my motherboard is the asus f1a75-m pro R2.0 with the usb ports in the back all my NTFS hard disks or usb sticks work fine, but then.. when i put them in the front usb ports of my chassis (silverstone milo ml-03) they wont mount... I have 2 usb 3.0 ports in front of the case connected with a internal usb 3.0 header. But i verified that the usb 3.0 ports on the back do mount the harddisk so it has nothing to do with usb 3.0 i think. The strange thing is, my mouse works fine on the front usb ports. Every usb hardware piece seems to work except if it has any memory inside it :( What seems to be the problem?

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• Where is the "pysdm" package?

  - by John Boy

  I am new to Ubuntu. I have some old hardware lying around so I decided to build a backup/storage device. I am trying to follow this lifehacker article. It asks me to open a terminal and run sudo apt-get install pysdm. However, I keep getting Unable to locate package pysdm. Does anyone know where my pysdm is or where I can get one. I have run ubuntu from a usb key and have installed it on a hard drive and get the same message.

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• .NET Performance Counters

  Recently while catching up on technical reading I ran across the subject of performance counters. I must admit that I had not looked closely at this subject in the past and thought it was time to do so. If you are not sure what performance counters are and what they provide simply put they have [...] Related posts:Microsoft set to deprecate OracleClient in the .NET 4.0 Framework How To Create a Virtual Hard Disk (VHD) in Windows 7 Microsoft Certifications ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Can I remove the latest ubuntu version without having to reinstall the old version?

  - by Emily

  I was using the 2.6 kernels with no problems, but when I updated to the 3.0 kernel, my bootup failed. I can manually boot with ctrl+alt+f1 startx and my login, but admittedly, i googled this and have no idea what I'm really doing. I have been trying to figure out how to go back to the old version, and eventually figured out the grub menu--i booted from all three 2.6 (.8, .10, and .11) editions of the previous version of ubuntu but they all had the same error as the 3.0 kernal. I can get logged in manually once the boot fails, but when i get to my desktop, wireless is not responsive and will not connect, and portable hard drives do not mount and/or are unresponsive. the previous version worked perfectly. I use an asus netbook. it's an eee pc. i don't have two OSs on it. i had to go to another computer to get to the forum... If the solution is simple, i just don't know what it is.

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• How long does an ext4 format take?

  - by Bill O'Dwyer

  The USB cable on my Iomega Prestige 1TB hard drive conked out a while back, and I've finally managed to get a new one. I removed the old NTFS file system because I use Windows maybe once a month, and then only for Windows-only activities. So I plug in the HDD to my laptop, and get it to start converting to ext4. Gparted is currently on the "create new ext4 file system" and has been for about 2 hours. Is this right? I know 1TB is fairly large, but the last time I did this, I'm pretty sure it was a fast(er) job.Can anybody shed some light on what's going on here?

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• Ubuntu took away permissions from my Data partition

  - by RobinJ

  The pangolin has struck again. The bug of the day for today is Ubuntu taking away my permissions on my Data partition (NTFS). One moment everything worked fine, the next moment I couldn't chmod anything anymore. chown throws no errors or warnings at all, but nothing has changed either. chmod keeps saying Operation not permitted. I've been messing around with /etc/fstab as suggested by other answers on AskUbuntu, but none of them seem to have the desired effect. This is my current line: UUID=25D7D681409A96B7 /media/Data ntfs defaults,umask=000,gid=46,permissions,users,auto,exec 0 0 For reference, this is the original one: UUID=25D7D681409A96B7 /media/Data ntfs defaults,umask=007,gid=46 0 0 (right after the problem started occuring) What do I need to do so I am the owner of my own hard drive again? I want to be able to just use chmod and chown (without sudo) without being told that some mysterious alien has taken over control of my Data partition. I can still read and write, but execution permissions seem to be the problem.

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• Can I install ubuntu on usb hdd without loosing data on it?

  - by Radek

  I have live-usb stick that I can boot latest live Ubuntu from. Then I have 160GB external WD hdd with few GB free of space. My notebook can't have any internal hdd so I was wondering if I can use my external one to install and boot Ubuntu and install new programs, save settings etc. without loosing (or moving around) any data on this external hdd. The best would be if I can somehow use the live-usb. I'm traveling so any "complicated" solution might be bit hard to implement. I do have an access to the Internet.

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• Why did Ubuntu and Windows start hanging mysteriously after I took a vacation?

  - by Ashrey Goel

  I installed Ubuntu alongside my Windows 7, after partitioning my HDD using Easeus partitioning manager. It was working perfectly, no problems, no data lost or corruption. Then I went away for 2 days and in my absence I don't know what happened in that period, now both Windows 7 and Ubuntu keep hanging continuously, like when you paint and change a brush it'll hang, I mean on very simple commands and I know my computer does not hang on such petty things. I use it for developing music and the specification are: Model: DELL-XPS Processor: Intel i5, 2.53 GHz RAM/Memory: 4GB Hard disk size: 500GB HDD Windows 7 partition: 417 GB Ubuntu Partition: 50 GB Please Help.

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• Can someone recommend an appriopriate drawing tablet that fits my needs?

  - by Syg

  I'm looking for something that can help me to easily create small hand drawn graphics and mock-ups digitalize technical drawings I would normally draw on a whiteboard. I'm a developer, not a designer, so it doesn't have to be high-end I guess. Just something to help make it easier, more fun and more productive to quickly draw mockups etc. After a quick search I landed on the wacom site, but it's hard for me to tell the difference between the offerings never having used something like this. Is small too small? is it annoying? Other suggestion are also welcome ofcourse. Thanx for any help you can give me

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• What You Said: How You Monitor Your Computer

  - by Jason Fitzpatrick

  Earlier this week we asked you to share your computer monitoring tips and tricks, now we’re back to share the wealth. Read on to see how your fellow reader monitor their gear. One of the more popular monitoring tools, thanks in part to the amount of things beyond just hardware it can monitor, in the comments was Rainmeter. Lee writes: I don’t really monitor my computer constantly, only when something is hanging up and I need to see what’s causing it. That being said, I do have Rainmeter so I can quickly see how much RAM or CPU is being used. For anything more detailed, I just go into the task manager and sort by RAM or CPU. Shinigamibob uses a wider range of tools to get a more in-depth look at difference aspects of his computer: 7 Ways To Free Up Hard Disk Space On Windows HTG Explains: How System Restore Works in Windows HTG Explains: How Antivirus Software Works

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• Disable suspend / hibernate via the policykit

  - by redonath

  I am trying to run Lubuntu 12.04, but if the computer suspends I am unable to bootup again. Instead I see the bios post, the hard disk light flickers once and I have to install again (I have tried to re-install grub2). I am new to Linux and what I found that best answered my question was posted by James Henstridge. The instructions say to create disable-shutdown.pkla in etc/polkit-1/50-local.d/ but this directory does not exist, so do I create a folder titled 50-local.d in poolkit-1 or do I have to place this file elsewhere?

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• Screen split oddly when OS is installed from a Live CD

  - by Brian

  Never used Linux before but I decided I want to start somewhere and Ubuntu seemed like the right place to start. I burned the 64bit version ISO onto a CD and installed it onto a fresh new hard drive I have. The Live CD works and the Live Distro thing works great. However when I attempt to install it, the screen splits oddly in a way where part of the right is on the left. Furthermore, after attempting to log in, the GUI doesn't show up and the computer would freeze and stay that way. However you can still move the cursor. I can't really get in or do anything (possibly because I don't know how) and tinker around since I am not too tech savvy. But I can follow instructions. Graphics Card Radeon hd 6670 I just tried the install with windows thing. There was the exact same problem.

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• Trying to install ubuntu netbook 10.10 but it hangs on the "who are you" screen

  - by Jonathan

  I have an acer aspire one ZG8 netbook, and I have wanted to put ubuntu on it for some time. But it won't install. It has wiped windows from my hard drive already, so I cant go back to the horrible 7 starter edition that came with this netbook. Would really love a way to fix this, but right now I am using the the "Try ubuntu" aspect just so I have use of the Internet. No idea if I will be able to download an older version and try again from here or what to do... Any help would be great.

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• should i concentrate on logical and puzzles part in programming, i want to be a web (flex)developer?

  - by abhilashm86

  I'm a student not good and can't easily crack at more puzzle, complex mathematics, hard logic problems? in college i studied c++, java, oops. I'm comfortable with all syntax and writing programs and using API's and doing mashups, i can do.......... but once a friend asked help on coding contest, i was in dilemma and frustration? It was simple and complex, i could not write code for those, so got scared? Is logical ability,complex mathematics, puzzles required for a developer point of view? please help and suggest methods to achieve things......

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• Using env variables with RewriteRule and ErrorDocument

  - by misterte

  Hi, I'm having problems with the following while config. my Apache server to Rewrite some urls. SetEnv PATH_TO_DIR /directory RewriteRule ^%{PATH_TO_DIR}/([a-zA-Z0-9_\-]+)/([a-zA-Z0-9_\-\.]+)/?$ /index.php?dir=$1&file=$2 ErrorDocument 404 %{PATH_TO_DIR}/index.php?dir=null&file=error This conf. used to work perfectly fine until I used SetEnv PATH... etc. I need to use this because there are lots of rules, not just those. Can anyone point out my mistake? Apache returns %{PATH_TO_DIR}/index.php?dir=null&file=error when I try anything (www.site.com/foo/bar for instance). Apache returns the ErrorDocument if i just try to fetch the index. I know it's not a problem with the rewrite rules because they work when I remove the PATH_TO_DIR variable and just hard code it. Thanks! A.

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