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• I receive the error 'grub-install /dev/sda failed' while attempting to install Ubuntu as the computer's only OS.

  - by Liath

  I am attempting to install Ubuntu on a box which was previously running Windows 7. I have also experienced the dreaded "Unable to install GRUB" error. I am not attempting to dual boot. I have previously run a Windows boot disk and removed all existing partitions. If I run the Ubuntu 12.04 install CD and click install after the config screens, I get the error Executing 'grub-install /dev/sda' failed. This is a fatal error. (It is the same error as this question: Unable to install GRUB) All the questions I've read while looking for a solution are related to dual boot. I'm not interested in dual boot, I'm after a clean out the box Ubuntu install. How can I achieve this? (For my sanity, please use very simple instructions when responding. I don't claim to have any talent either for linux or as a sysadmin) Additional details copied from comments dated: 2012-05-29 ~15:19Z After booting from the CD, clicking Try Ubuntu, and then sudo fdisk /dev/sda I get fdisk: unable to seek on /dev/sda: Invalid argument sudo fdisk /dev/sdb gives Device contains neither a valid DOS partiion table, nor Sun, SGI or OSF disklabel. Building a new DOS disklabel with disk identifier 0x15228d1d. Changes will remain in memory only until you decide to write them. After that of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite). Command (m for help): I should add the Live CD desktop is graphically bad. I've got missing parts of programs and the terminal occasionally reflects to the bottom of the screen. But I can't imagine this is related.

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• My computer may have been compromised, what should I do?

  - by InkBlend

  A few weeks ago, my machine (lets call it "main") was logged into wirelessly from an unauthorized host, probably using ssh. I did not detect the intrusion until a few days ago, and my machine is completely shut down. I found the login using this line from last: myusername pts/1 ipad Tue Oct 15 22:23 - 22:25 (00:02) Needless to say, not only does no one in my family own an iPad, but almost none of my friends do, either. This makes me suspect that whoever was behind this changed the hostname of their machine. Additionally, I discovered this line in the last output on another machine of mine ("secondary"): myusername pts/2 :0 Tue Oct 15 22:23 - 22:23 (00:00) This line coincides with the timestamp from main, which has password-less ssh access (through keys) to secondary. Is it possible that whoever broke in to main has also rooted secondary? How can I prevent this from happening again? Are there logs that I can look through to determine exactly how main was accessed (I am the only user on the system and have a very strong password)? Is it at all possible that this is just a weird bug that occurred? Should I, and where should I start looking for rootkits and/or keyloggers? In short, what should I do?

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• Are the National Computer Science Academy certifications worth it?

  - by Horacio Nuñez

  I have a question regarding the real value of having NCSA's certifications. Today I reach their site and I easily passed the JavaScript certification within minutes, but I never reach questions related to Literal Javascript Notation (Json), closures or browser specific APIs. This facts let me to doubt a bit of the real value of the test (and the proper certification you can have if you pay them $34), but maybe Im wrong and just earned a respected certification within the States for easy questions... in which case I can spend some time doing other certifications on the same site. Did you have an NCSA certification and think is worth having it in your resume, or you know of a better certification program?

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• Create option to load Ubuntu or Windows 7 at start-up

  - by AXK

  We have a new Dell Optiplex 790 desktop with Windows 7 and just installed Ubuntu 12.04 on it using a USB stick that was configured as a boot drive. We created a new partition for Ubuntu during installation using the partition editor that comes up during installation. Everything seems to have gone fine with the installation except that, unexpectedly, there is no option to boot up Ubuntu when the computer is started. We just start the computer and Windows starts up with no option to ever start Ubuntu. The only way we have gotten Ubuntu to start is by putting the USB stick used for installation back into the computer and having the computer boot from it. Then GRUB shows up and the Ubuntu OS that we installed starts up (rather than the live-CD version on the USB stick). Previous times we have installed Ubuntu, GRUB shows up when we start the computer and we can choose among the various OSes installed. Can anyone suggest what to do? We want to have the option to launch either Windows 7 or Ubuntu 12.04 when we start the computer, with the default being Windows 7. Right now there is no option and Windows 7 just starts the way it did before we installed Ubuntu. Note that if we hit F1 soon after starting the computer, we get some sort of Windows bootloader (not sure of exact name) but there is no option for Ubuntu; just Windows 7. Also note that if we hit the shift key soon after starting the computer, as some help pages have suggested, nothing happens (Windows 7 is loaded as usual). Thanks in advance!

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• How do I boot to a windows recovery partition from GRUB in a Toshiba computer?

  - by Andy Groff

  This should be simple but I cannot figure out how to do it. I've been dual booting ubuntu and vista for a while. About 8 months ago, I realized my windows partition got corrupt and does not boot. This wasn't a problem since I didn't need it anyways, but now I do need windows. Using the disk manager I can see a partition called Toshiba System Volume which is 1.6 GB and one called HDD Recovery which is 7.8 GB. I assume the second one is what I need and i'm not sure what the first one is for. Anyways, how do I boot to this one? Is it a matter of configuring GRUB to boot to it? Once I do boot to it will it let me only reformat my windows partition, or is it going to restore the entire hard drive to factory condition? I assume I'll get the general windows installer which lets me choose the partition but, as you can probably tell, I've never used a recover partition. Should I burn the contents of the partition to a disk and boot to that? Sorry if this is obvious but I'm confused and cannot figure this out.

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• Improved Customer Experience, but at what Cost? See the DELL Computer experience with RTD

  - by Richard Lefebvre

  We can all probably agree that improving your customers' experience is a good thing. But a key question many people are asking is will it help your organization and, in particular, what are the financial benefits? That's a good question, especially when companies ARE experiencing phenomenal return on investment (ROI). Of course, there are many factors that impact ROI or other measures of success, but we'd like to share some success stories as examples of customer experience in action and delivering positive results. If you would like to learn more about the economics of customer experience, see Brian Curran's presentation at the Oracle Customer Experience Summit last month. In this series of blog posts, we'll share actual customer stories. Today's example is Dell, which uses Oracle Real-Time Decisions (RTD) and Siebel CRM as part of their customer experience portfolio to better understand their customers' needs and wants and provide consistent interactions. Regular readers of this blog are probably familiar with Siebel, but RTD may be new to many of you. RTD is a complete decision management solution that delivers real-time decisions and recommendations and automatically renders decisions within a business process to create tailored messaging for every customer interaction. What does that mean? In the video below, Dell describes how customer experience is important not just for one interaction channel, but across all "vehicles." RTD is helping Dell understand customer behavior and communicate with the customer in a more relevant manner, across all communication  or interaction channels including sales and service call centers, email marketing and online. Dell continues to expand use of RTD because the benefits are showing up in sales, service and marketing results including 19% increase in close rates, faster issue resolution and 40% improvement in revenue per click in email marketing. Video link By Tony Berk on Nov 15, 2012

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• How do you apply proxy settings per computer instead of per user?

  - by Oliver Salzburg

  So far, I've used a user group policy object utilizing Internet Explorer maintenance to set a proxy for the user in IE. We have now deployed the Enterprise Client (EC) starter group policy to our domain and this policy affects this behavior. The EC group policy uses the policy Make proxy settings per-machine (rather than per-user). This policy describes itself as: This policy is intended to ensure that proxy settings apply uniformly to the same computer and do not vary from user to user. Great! This seems to be an improvement over my previous setup. If you enable this policy, users cannot set user-specific proxy settings. They must use the zones created for all users of the computer. What zones and where do I configure the proxy settings for them? I assumed the policy would simply take the user settings and apply them, but that's not what's happening. Now no proxy server is set at all. So my previous settings obviously no longer have any effect. So far, I've only come up with solutions that involved direct manipulation of the Windows registry. Which is fine, I guess, but the way the proxy is configured for users makes it appear as if there could be a higher level approach.

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• Prevent collisions between mobs/npcs/units piloted by computer AI : How to avoid mobile obstacles?

  - by Arthur Wulf White

  Lets says we have character a starting at point A and character b starting at point B. character a is headed to point B and character b is headed to point A. There are several simple ways to find the path(I will be using Dijkstra). The question is, how do I take preventative action in the code to stop the two from colliding with one another? case2: Characters a and b start from the same point in different times. Character b starts later and is the faster of the two. How do I make character b walk around character a without going through it? case3:Lets say we have m such characters in each side and there is sufficient room to pass through without the characters overlapping with one another. How do I stop the two groups of characters from "walking on top of one another" and allow them pass around one another in a natural organic way. A correct answer would be any algorithm, that given the path to the destination and a list of mobile objects that block the path, finds an alternative path or stops without stopping all units when there is sufficient room to traverse.

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• What does it mean if a job requires a "Bachelor's degree in Computer Science or related field"?

  - by Bill

  Specifically, what is meant by "related field"? I'm in the process of pursuing an IT Infrastructure B.A.S. from the U of M (Twin Cities), but have been playing around with the idea of just doing the CSCI B.S. I don't want to be a hardcore programmer, but would having the CSCI degree, instead of the ITI degree, open more doors to whatever profession within the IT world I end up setting my sights on?

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• How do I boot to a windows recovery partition from GRUB on a Toshiba computer?

  - by Andy Groff

  This should be simple but I cannot figure out how to do it. I've been dual booting ubuntu and vista for a while. About 8 months ago, I realized my windows partition got corrupt and does not boot. This wasn't a problem since I didn't need it anyways, but now I do need windows. Using the disk manager I can see a partition called Toshiba System Volume which is 1.6 GB and one called HDD Recovery which is 7.8 GB. I assume the second one is what I need and i'm not sure what the first one is for. Anyways, how do I boot to this one? Is it a matter of configuring GRUB to boot to it? Once I do boot to it will it let me only reformat my windows partition, or is it going to restore the entire hard drive to factory condition? I assume I'll get the general windows installer which lets me choose the partition but, as you can probably tell, I've never used a recover partition. Should I burn the contents of the partition to a disk and boot to that? Sorry if this is obvious but I'm confused and cannot figure this out.

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• What exercises counter the back pain of sitting at a computer for 15 hours a day? [on hold]

  - by Sam

  I work up to 15 hours a day (not everyday :)) programming. When I do this I get a very sore lower back. I don't want to spend $1000 on a special chair like Joel Spolsky says. I'm sure I'm not alone here. Has anybody encountered this and found an exercise/other method to combat it? Maybe somebody with more physical education than me about opposing muscle groups or something. PS (not working fifteen hours a day isn't an answer, it's how I work best) and it's not off topic as programming is about more than code - it's a verb.

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• What non-computer based programming tools do you consider invaluable? [closed]

  - by Schroedinger

  Possible Duplicate: What physical tools do you find useful to work as a programmer? I'm talking about things like whiteboards for process planning, paper for mapping out logic flows, particular books that you've found relevant, things in your workspace that help you think and process what you're working on and how to attack problems. I'm starting out in a corporate environment and want to have an understanding of what tools really work for other programmers to help them work through their problems and solutions.

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• 7 drived classes with one common base class

  - by user144905

  i have written the following code, //main.cpp #include<iostream> #include<string> #include"human.h" #include"computer.h" #include"referee.h" #include"RandomComputer.h" #include"Avalanche.h" #include"Bureaucrat.h" #include"Toolbox.h" #include"Crescendo.h" #include"PaperDoll.h" #include"FistfullODollors.h" using namespace std; int main() { Avalanche pla1; Avalanche pla2; referee f; pla1.disp(); for (int i=0;i<5;i++) { cout<<pla2.mov[i]; } return 0; } in this program all included classes except referee.h and human.h are drived from computer.h. each drived calls has a char array variable which is initialized when a member of a drived class is declared. the problem is that when i declare tow diffrent drived class memebers lets say Avalache and ToolBox. upon printing the char array for one of them using for loop it prints nothing. However if i declare only one of them in main.cpp the it works properly. and the file for computer.h is as such: #ifndef COMPUTER_H #define COMPUTER_H class computer { public: int nump; char mov[]; void disp(); }; #endif ToolBox.h is like this: #ifndef TOOLBOX_H #define TOOLBOX_H #include"computer.h" class Toolbox: public computer { public: Toolbox(); }; #endif finally Avalanche.h is as following: #ifndef AVALANCHE_H #define AVALANCHE_H #include"computer.h" class Avalanche: public computer { public: Avalanche(); }; #endif

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• Is programming or computer science in general, all about algorithms?

  - by wakandan

  As a grad student, I find it more and more common for prestigious companies (like Google, Facebook, Microsoft,...) to put algorithm questions in their test and interviews. A few startups I applied to also asked about algorithms. I wonder if algorithms fluency is the most important thing for software developer in those companies? If the answer being yes, what are the best method or resources for one to learn & practice about algorithms effectively? I can't seem to get interested in solving seemingly too complicated problems found in most textbook or websites. Though easily understand basic algorithms (like quicksort, bubblesort,...), I find it immensely difficult to remember and reuse them later. Thanks. P/S: If you ask me what I like, it's building good softwares to solve users' problems innovatively. I suppose that does not necessarily mean the software has to be very complicated.

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• Which is better a computer science degree or a Software engineer degree?

  - by Shadow wolf

  I'm asking here so since you all have experience in or around game programming, that's what I want to do, and I’m trying to find as many options as I can before my senior year, which is next year. So do you have any opinions on the matter of which would give me a better education in programming? Please no talking about anything other than the two degrees because I know of game programming degrees out there but I like to see which of these would provide the best alternate choice.

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• is it possible to ssh into ubuntu server with keys and from another computer using password?

  - by Sandro Dzneladze

  I have ubuntu server at home, and I use SSH keys to log in via terminal from my laptop. Rarely, but mostly from work, I need to access this server, but I dont want to copy keys on my work laptop - Id rather just use plain password for that. So if I enable password log in from ssh config file, it will ask me password on my laptop too even though it contains keys, right? Is there a way to stop this behavior? Thanks.

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• Should students have the right to do exams using a computer?

  - by vemv

  In some colleges students are let to use an IDE and Internet and in mine you have to write down your solution in paper. As far as I know, it's pretty much impossible to make a correct non-trivial program on the first try. I'd be fine with no using computers if my teachers assessed my approach instead my code -literally-... that's not the case unfortunately. Which ones are more usual, 'written' or 'coded' exams? And which way is the most adequate?

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• On my computer, will Ubuntu be faster then XP? [closed]

  - by pgrytdal

  I was recently given a HP Compaq presario SR1200NX. It has Windows XP installed on it. After having Windows 7, then Ubuntu, I find XP to be really slow. I was wondering if XP is slow? The processor itself is slow? Or a combination thereof? Specs can be found here: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00245801&cc=ca&dlc=en&lc=en&jumpid=reg_r1002_usen_c-001_title_r0002

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• 2 year cis degree and in school for computer science what can I do?

  - by chame1eon

  Hi I am 29 and have a recent 2 cis year degree from a community college , an A+ certification , and meager experience with web stuff ( Java , Javascript , php ) while in my 1 year help desk internship. In all the programming classes I was able to blow through the homework easily even while other students were panicking and dropping. I think I have managed to avoid the most atrocious noob/self taught mistakes ( spaghetti code etc) by just doing research before starting something and trying to keep good design in mind. Even so I'd have to make heavy use of references to crawl through even simple projects that would result in fully finished useful applications. I need a job now and I am tired of the slow pace of the classes and would love to get any kind of practical experience I could. The problem is that I am not sure what I should be trying to do. I have a very strong preference for application programming or at least anything light on design and preferably pretty low level. If I can't do that then anything technology related , for example help desk would be better than nothing. I live near Raleigh NC. Am I qualified for anything that could contribute to coding (C++ or Java ) experience or even web development though I don't really like it. Would web development experience help. If not is there anything I could read or do that could help? Is the help desk my only choice? If it is, are there any relatively quick certifications or anything similar that would help while I am waiting? Sorry about the long multi-part question. Thanks for reading.

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• I want to play mp3 in rythmbox but it says python v2 plugins requires mpeg-1 layer mp3 decoder but i dont have internet on that computer,

  - by Ubuntu_lover

  Because i use internet from usb device which supports only on windows, and when I downloaded offline files from packages.ubuntu.com and linuxappsfinder.com and tried to install them in ubuntu, i just double clicked on such file(whose format extension was .deb), then it opened in ubuntu software center but said, dependency is not supported, How can i install softwares and plugins or codecs in ubuntu, without internet? I tried to make file through terminal using zipped files, (tar.bz2), but said something xml not found.

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• How can I effectively use a netbook and a desktop computer together for programming?

  - by Mana

  Currently, in my workspace, I have a netbook sitting off to the side gathering dust while I write code on my desktop. As a result, the only use my netbook gets coding-wise is when I'm writing up a quick Python script to model a given problem or concept in class; I never use it at home for coding, or for anything at all, as it is all possible and faster on my (much more powerful) desktop. I feel like this is wrong and that I should be making better use of my netbook. What effective uses have you found for a netbook and a desktop together when programming (or for software development in general)? What are the merits of this practice?

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• After installing Ubuntu my computer boots into GRUB rescue mode after displaying 'no such partition' error message.

  - by VictorVictor5

  I wanted Ubuntu on my Gateway Solo Laptop. It had Win98 on the C:\ and WinXP on the D:\. Before the install, I could not boot from CD, but I could boot from floppy. I installed Ubuntu to run alongside Windows XP as that was one of the options. It didn't detect Win98, but I swear it's on there. Install seemed fine and then it asked me to reboot. When I rebooted, I got the message error: no such partition and the grub rescue> command prompt. I've looked around, but some commands, like sudo, don't work. One command I did get to work was set root=(hd0,0) if that helps. I'm a noob, and it was a pain installing Win98 and XP since this system is so old. I don't want to wipe my drive and start all over! Additional details copied from comments Addendum, I restored my master boot record via my Win98 boot floppy and typing in frisk /mbr. But, I'd still like to get ubuntu - any help? If I restored my master boot record - did I delete Ubuntu?

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• Poll: What kind of computer should a corporate provide to their developers.

    I have been collecting a poll to almost any developer I find on my way as well as business owners. I have been looking to see what a small development shop, medium size company and a big corporate considers when providing development computers to their software developers. This has being very intriguing to me. In my career I found different software developers, the ones that work always with one product and one framework, as well as the one that keeps a few frameworks and projects. Of course...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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• How can I view a .evt file saved with the Event viewer of another computer?

  - by Adolfo G.U.

  I have a .evt file saved with the EventViewer of another computer. I think I can use my computer's EventViewer as long as I have the same version of the OS. Are there any other alternatives?

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• How do I subvert computer idle detection on Windows?

  - by sharptooth

  In order to detect user absence GetLastInputInfo() can be used. I want to make GetLastInputInfo() return that I've just used keyboard/mouse all the time - as I've been actively using the computer so that whoever relies on GetLastInputInfo() thinks I'm actively using the computer. Can I use any Windows API functions to achieve that?

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