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• Ubuntu 11.10 loads from live usb fine, but boots to black screen from harddrive. Why?

  - by Estel

  A few days ago I had a hard drive failure, which was running Windows XP (32-bit) just fine. The second hard drive in my computer held a few unimportant files, so I formatted it in the Ubuntu setup and installed 11.10 without a hitch. I had been using it for about a week, but decided to install Windows 7 (64-bit) in order to utilize Networking with my home server (running Windows Server 2000). My system is 64-bit based, and thus I had no problems installing other than a basic RAM error that required me to remove my RAM down to a single stick. I played with the settings in Windows 7 for around an hour before I shut down. After reinstalling the RAM, Windows 7 would not boot. In this, I then assumed that something about my system was rejecting Win7 and I reinstalled Ubuntu. However, now Ubuntu (11.10) boots into black screen, and I've already attempted activating the grub menu with the shift key, and following steps listed here: https://wiki.ubuntu.com/X/Troubleshooting/BlankScreen but nothing seems to work. I've reinstalled twice now, with the same result each time. Now, the very odd part about this whole scenario is that the USB I installed from has no problems booting as a live USB. This puzzles me greatly, because the hard drive boots straight to black screen and the live USB loads normally. At this point, my only theory is that the boot sector of the hard disk was somehow corrupted with Win7, and that Ubuntu was unable to completely write through. I used Darik's Boot n Nuke to wipe the drive, but was met with an error, this also puzzles me because the hard disk has no promblems reading or writing. Any suggestions/comments are appreciated. If you have a theory, I will be more than happy to oblige. Additional information: Intel Core2 Duo e6400 2.13GHz nVidia GeForce 7-series (7900 GS) 4 GB DDR2 333MHz (2x 2GB) Dell XPS 410 BIOS Revision 2.5.3

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• Why is the superblock last mount time in the future?

  - by user69541

  Future time: Since installing Ubuntu 12.04, I regularly have to fun fsck and reset my clock because it shows a 'future time' : Err.Msg. "superblock last mount time is in the future by less than a day, probably due to hardware clock being incorrectly set." FIXED. According to what I have read, it looks like I'm in the right place to get an answer. Following are my feeble attempts to rectify this annoyance: mjh@mjh-desktop:~$ sudo service ntp start [sudo] password for mjh: ntp: unrecognized service mjh@mjh-desktop:~$ mjh@mjh-desktop:~$ sudo apt-get install update Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package update mjh@mjh-desktop:~$ sudo service ntp start ntp: unrecognized service mjh@mjh-desktop:~$ Suggestions? Matthew

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• Tutorial: Why Use GRUB2? Good Question! (part 3)

  As we come to the end of Akkana Peck's excellent series on mastering GRUB2, it's not clear what advantages it has over legacy GRUB, or even good old LILO. It seems it's gone backwards. In today's installment we learn how to translate some common and mysterious error messages, and how to manage a multi-boot system with GRUB2.

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• Why does my Ubuntu Software Center not work? [closed]

  - by Alex Mundy

  Possible Duplicate: How do I fix a “Problem with MergeList” error when trying to do an update? I've been having trouble with my Software Center. Whenever I try to open it, or even do an apt-get in the terminal I get this message: Reading package lists... Error! E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_precise-security_restricted_binary-i386_Packages E: The package lists or status file could not be parsed or opened. How do I fix it? Note: I'm new to Ubuntu. I need simple instructions for the moment.

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• Why do we use networking libraries instead of plain NSURLRequests and NSURLConnection ?

  - by Amogh Talpallikar

  in iOS development, I have often seen people creating a networking module to interact with their APIs. This module generally sits on top of a networking framework like MKNetWorkKit or AFNetWorking. In most of the cases, It's all about sending GET,POST request and parsing the response which is in most cases JSON. What extra practical benefits that these libraries provide that an iOS developer should be leveraging which the plain Cocoa Networking APIs lack ? I can understand RESTKit as one exception where it takes care of the conversion of JSON to native objects and also interfaces with Core Data but what about others ?

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• Why don't smart phones have an auto-forget password feature? [closed]

  - by Kelvin

  Storing passwords to external services (e.g. corporate email servers) on smart phones is very insecure, since phones are more easily stolen. Has any vendor implemented a feature to only cache a password in memory for a limited amount of time? After the time period has elapsed, the app would ask for the password again. EDIT: I should've clarified - I'm aware that many (most?) users are lazy and want to just "set it and forget it". The always-remember feature will probably always be present. I was curious about an option to enable auto-forget for the security-conscious.

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• Why won't my graphics work in Ubuntu 12.04 LTS?

  - by user170974

  I'm very new to Ubuntu and to Linux in general, and took the leap and formatted my PC to Ubuntu 12.04 LTS very recently :) I seem to be having some trouble getting my graphics card to run properly, I looked over what information I could find but I still cannot get it up and running and figured this was a good place to ask for help. The information I can find on my graphics is as follows: (Terminal command) lspci outputs: 01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS880M [Mobility Radeon HD 4225/4250] 02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] I tried using a mixture of the following links: How do I fix my installation of ATI Catalyst Video Driver in 12.04 LTS? What is the correct way to install ATI Catalyst Video Drivers (fglrx)? Ubuntu Precise Installation Guide But it does not seem to work, since running fglrxinfo in terminal gives: display: :0.0 screen: 0 OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x301) OpenGL version string: 1.4 (2.1 Mesa 9.0.3) What am I doing wrong here? All help appreciated ;) Edit: I have tried the legacy driver from www2.ati.com/drivers/linux/amd-driver-installer-catalyst-13-4-linux-x86.x86_64.zip I also tried the guide at https://launchpad.net/~makson96/+archive/fglrx which caused the system to crash (blackscreen, no boot) Neither seemed to work. I did however reinstall ubuntu 12.04 LTS, and re-tried both with no success. Reintalling ubuntu did however fix the broken dependencies problems, etc.

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• SEO For Beginners - A Fast and Easy Overview of How SEO Works and Why it is Important

  If you are just getting started with your online business one of the first and most important things you should be aware of is search engine optimization or "SEO" as it is commonly referred to on the Internet. Search engine optimization involves a number of steps that are necessary to ensure your business is found by your target audience and it will be the foundation upon which you build your online business.

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• Why are my scene's depth values not being written to my DepthStencilView?

  - by dotminic

  I'm rendering to a depth map in order to use it as a shader resource view, but when I sample the depth map in my shader, the red component has a value of 1 while all other channels have a value of 0. The Texture2D I use to create the DepthStencilView is bound with the D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE flags, the DepthStencilView has the DXGI_FORMAT_D32_FLOAT format, and the ShaderResourceView's format is D3D11_SRV_DIMENSION_TEXTURE2D. I'm setting the depth map render target, then i'm drawing my scene, and once that is done, I'm the back buffer render target and depth stencil are set on the output merger, and I'm using the depth map shader resource view as a texture in my shader, but the depth value in the red channel is constantly 1. I'm not getting any runtime errors from D3D, and no compile time warning or anything. I'm not sure what I'm missing here at all. I have the impression the depth value is always being set to 1. I have not set any depth/stencil states, and AFAICT depth writing is enabled by default. The geometry is being rendered correctly so I'm pretty sure depth writing is enabled. The device is created with the appropriate debug flags; #if defined(DEBUG) || defined(_DEBUG) deviceFlags |= D3D11_CREATE_DEVICE_DEBUG | D3D11_RLDO_DETAIL; #endif This is how I create my depth map. I've omitted error checking for the sake of brevity D3D11_TEXTURE2D_DESC td; td.Width = width; td.Height = height; td.MipLevels = 1; td.ArraySize = 1; td.Format = DXGI_FORMAT_R32_TYPELESS; td.SampleDesc.Count = 1; td.SampleDesc.Quality = 0; td.Usage = D3D11_USAGE_DEFAULT; td.BindFlags = D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE; td.CPUAccessFlags = 0; td.MiscFlags = 0; _device->CreateTexture2D(&texDesc, 0, &this->_depthMap); D3D11_DEPTH_STENCIL_VIEW_DESC dsvd; ZeroMemory(&dsvd, sizeof(dsvd)); dsvd.Format = DXGI_FORMAT_D32_FLOAT; dsvd.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D; dsvd.Texture2D.MipSlice = 0; _device->CreateDepthStencilView(this->_depthMap, &dsvd, &this->_dmapDSV); D3D11_SHADER_RESOURCE_VIEW_DESC srvd; srvd.Format = DXGI_FORMAT_R32_FLOAT; srvd.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D; srvd.Texture2D.MipLevels = texDesc.MipLevels; srvd.Texture2D.MostDetailedMip = 0; _device->CreateShaderResourceView(this->_depthMap, &srvd, &this->_dmapSRV);

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• why is it a risk to clone a LUKS container?

  - by laramichaels

  I recently installed Ubuntu onto an encrypted partition using the LUKS+LVM combination that the 'alternate' installer offers. Now I want to create backups of my HD. From the LUKS FAQ: 6.15 Can I clone a LUKS container? You can, but it breaks security, because the cloned container has the same header and hence the same master key. You cannot change the master key on a LUKS container, even if you change the passphrase(s), the master key stays the same. That means whoever has access to one of the clones can decrypt them all, completely bypassing the passphrases. How can the existence of a perfect clone of my encrypted HD break security if it contains the exact same information as my live encrypted HD? In which sense does keeping updated clones of my LUKS-encrypted HD around "break security"?

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• Dim (NEARLY blank) laptop screen, secondary screen works - why?

  - by LIttle Ancient Forest Kami

  My laptop screen is (almost) black while my secondary screen is fine. I believe it to be backlight / brightness related. Problem description it starts when I start the laptop system loads and works fine, just screen has problems I can see the screen though very faintly / dimly - it's hard to see anything which ain't very white e.g. starting screen has big Thinkpad logo in white, large font - I can see it, though very dimly second screen works very well Official backligtht debugging: using acpi setting as prescribed there for Thinkpads didn't help I can see an entry in /sys/class/backlight/ and it changes when I press hotkeys for brightness (current backlight power for instance goes up or down) acpi-off didn't helpm neither did acpi_backlight=vendor Hardware data Laptop is Thinkpad Edge with glossy screen. 4 processors, 2 cores, exemplary CPU data from cat /proc/cpuinfo reports Genuine Intel i5 (M 480 @ 2.67GHz). OS is Ubuntu Lucid, 10.04 LTS, 64-bit, with Linux generic kernel (2.6.32-44) and GNOME 2.32.2 (though I doubt there lies the problem). $ lspci | grep VGA 01:00.0 VGA compatible controller: ATI Technologies Inc M92 [Mobility Radeon HD 4500 Series] $ lshw -C display *-display description: VGA compatible controller product: M92 [Mobility Radeon HD 4500 Series] vendor: ATI Technologies Inc physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:33 memory:c0000000-dfffffff(prefetchable) ioport:2000(size=256) memory:f0300000-f030ffff memory:f0320000-f033ffff(prefetchable) Driver I was NOT running any proprietary drivers, just checked with "Hardware drivers". There is one for ATI that is suggested there, though I didn't need it so far. UPDATE: changing the driver to proprietary one (ATI/AMD FGLRX) didn't help. Tried and failed Resetting / running on power or battery / charging / getting rid of static electricity / warming up *doesn't help* This is NOT a blank-screen problem, at least it isn't following official Ubuntu black-screen diagnostics - I can see my screen, though barely. What I will try next: - check last updates I've made - IIRC I am running on nomodeset already, but will verify this Any ideas how to proceed best? What is most probable cause?

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• What is the best unit test framework for .NET and why?

  - by rmx

  It seems to me that everyone uses NUnit without even considering the other options. I think this is because: Everyone is familiar with it already so they won't have to learn a new API. It is already set up with their continuous integration server to work with NUnit. Am I wrong about this? I decided to use xUnit on one of my own projects recently and I love it! It makes so much more sense to me and conceptually it seems like a definite step forward from NUnit. I'd like to hear opinions on which framework is actually the best - not taking into consideration having to learn it or reconfigure your automated testing.

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• Why don't we have an "unofficial" software center with all the PPAs?

  - by balki

  Many questions are answered simply with add this repository and install. I understand that Ubuntu developers cannot quickly verify all packages and make them available in official repositories. But is there an unofficial main repository or software center where developers can register their PPAs? Adding individual repositories is a pain and the update also takes longer as it has to check all the PPAs. Like we have alternative markets for android, it would be great if there are any popular alternative software sources that we can reasonably trust.

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• Why wont the LibGDX's main class Initialize on Android Launcher?

  - by BluFire

  So I was searching for different ways that could suit me in programming and came across LibGDX. Naturally I looked at the tutorial. As I was doing it, I was following the steps word for word, except naming the classes. In the end, I was able to create the desktop launcher for the game but not the android launcher. The following error is my error: Cannot instantiate the type Game (Game is the name of the class) I got the tutorial from http://steigert.blogspot.com.au/2012/02/1-libgdx-tutorial-introduction.html The link in the tutorial is the original but it uses jogl instead of lwjgl.

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• Why does the sudo command not work in chroot?

  - by katarina

  I just installed a 32-bit chroot to run on my 64-bit system. In the chroot environment, the sudo command doesn't work, it says sudo: command not found Also, when I try the su root command, my password doesn't work (su: authentication failure). What password do they want? I'm quite new to Ubuntu, so actually I don't really know what I'm doing. I am just trying to follow instructions. I solved this particular problem simply by starting the chroot by the command: katarina@ubuntu:~$ schroot -c oneiric_i386 -u root instead of the one I used the first time: katarina@ubuntu:~$ schroot -a I still have some other problems, but I guess that's not for this question.

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• why the next button doesn't work in Joomla! 2.5.4 Installation [closed]

  - by rahul

  I was trying to insall the Joomla! 2.5.4 Installation. But I got stucked in the first step only. The button doesn't respond on clicks. I tried previous version like 1.5.26. But here also the process got hang after the 3rd step. In the 4th step the next button doesn't work as before. what to do, I am in dilemma. I am using XAMPP server for my localhost,please guide me, I lost complete one day in installing Joomla.

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• Why is C++ used for game engines? How about its future in game engines?

  - by kasperov

  C++, as I have seen, is being heavily used in 3d video game engines.... Is it because of the performance issues, legecy code or libraries such as DriverX? If performance, libraries and code infrastructure are the reasons, dosen't that make C++ indispensible, at least for game engines? (ie, we have no other option even in the very distant future). I asked this because, I have the right to know the upcomming future trends in game engines.

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• Why do almost all Java jobs (postings and from recruiters) say J2EE rather than the newer JEE versions?

  - by Rick

  I'm still fairly new to Java but have definite comfort now working within the framework I am used to which would mainly be focused on Spring, Hibernate and JEE 6. It seems like every time I talk to a recruiter all they do is throw around the keyword "J2EE", they need someone with J2EE experience, etc. I am aware that legacy systems would still be using J2EE but it seems like at least some jobs would be advertising JEE now. Just curious if they are just stuck with some keyword that they can't seem to wrap their heads around it having a newer version or what. Having not done Java all that long, I haven't used J2EE specifically but wouldn't it be fairly easy to adapt having used the newer enterprise edition? Just curious to hear anything about this from someone with more experience.

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• Why is my primitive xna square not drawn/shown?

  - by Mech0z

  I have made this class to draw a rectangle, but I cant get it to be drawn, I have no issues displaying a 3d model created in 3dmax, but shown these primitives seems much harder I use this to create it board = new Board(Vector3.Zero, 1000, 1000, Color.Yellow); And here is the implementation using System; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Shapes; using Quadro.Models; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; namespace Quadro { public class Board : IGraphicObject { //Private Fields private Vector3 modelPosition; private BasicEffect effect; private VertexPositionColor[] vertices; private Matrix rotationMatrix; private GraphicsDevice graphicsDevice; private Matrix cameraProjection; //Constructor public Board(Vector3 position, float length, float width, Color color) { var _color = color; vertices = new VertexPositionColor[6]; vertices[0].Position = new Vector3(position.X, position.Y, position.Z); vertices[1].Position = new Vector3(position.X, position.Y + width, position.Z); vertices[2].Position = new Vector3(position.X + length, position.Y, position.Z); vertices[3].Position = new Vector3(position.X + length, position.Y, position.Z); vertices[4].Position = new Vector3(position.X, position.Y + width, position.Z); vertices[5].Position = new Vector3(position.X + length, position.Y + width, position.Z); for(int i = 0; i < vertices.Length; i++) { vertices[i].Color = color; } initFields(); } private void initFields() { graphicsDevice = SharedGraphicsDeviceManager.Current.GraphicsDevice; effect = new BasicEffect(graphicsDevice); modelPosition = Vector3.Zero; float screenWidth = (float)graphicsDevice.Viewport.Width; float screenHeight = (float)graphicsDevice.Viewport.Height; float aspectRatio = screenWidth / screenHeight; this.cameraProjection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45.0f), aspectRatio, 1.0f, 10000.0f); this.rotationMatrix = Matrix.Identity; } //Public Methods public void Update(GameTimerEventArgs e) { } public void Draw(Vector3 cameraPosition, GameTimerEventArgs e) { Matrix cameraView = Matrix.CreateLookAt(cameraPosition, Vector3.Zero, Vector3.Up); foreach (EffectPass pass in effect.CurrentTechnique.Passes) { pass.Apply(); effect.World = rotationMatrix * Matrix.CreateTranslation(modelPosition); effect.View = cameraView; effect.Projection = cameraProjection; graphicsDevice.DrawUserPrimitives(PrimitiveType.TriangleList, vertices, 0, 2, VertexPositionColor.VertexDeclaration); } } public void Rotate(Matrix rotationMatrix) { this.rotationMatrix = rotationMatrix; } public void Move(Vector3 moveVector) { this.modelPosition += moveVector; } } }

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• Why blogger puts BR tags only when content served via RSS feed?

  - by tamashumi

  I have a problem with using my new blog RSS feed. I wrote a post (the first one) with some code examples formatted by SyntaxHighlighter. To paste a code sample I'm switching from WYSIWYG to HTML view and put the code inside pre tag like this (don't worry, h4 tag was opened a line above the screenshot area): The problem is that such pre tag, when later accessed via RSS feed contains br tags instead of new line characters. Below is screenshot of the adequate RSS source code: What's most important when accessed via www, the post html is formatted fine, no brs inside pre. I verified that by downloading the blog post with wget. So I believe this isn't SyntaxHighlighter issue nor any 'new line' formatting on blog post save. This is a real problem as I want aggregate my blog on employers blog and all formatting of code examples is broken because of that. The base question is: how to get rid of those unwanted brs served via RSS? What's strangest friend of mine also uses blogger for such aggregation and he has no such issue. I checked his RSS feed and there are no brs inside pre tags. We also compared settings of our blogs. However we have found no clue. The blog post RSS for the blog (just check source and search for string: pre class="brush) Mentioned friend's blog Last thing: I see content served from RSS is now also html encoded. If I remember well, it wasn't previously.

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• Why doesn't max-height hold in Mobile safari in landscape mode?

  - by Mick79

  I am building a small portfolio site for myself and have come across an odd quirk. I have an image inside a container, and to allow for multiple screen sizes, I am setting all dimensions in % rather than pixels. in iphone portrait mode, everything is fine. However in landscape mode, my image bursts out of its container, completely ignoring the max-height:100%; rule that works fine in portrait. code: #centralident{ position:relative; width:50%; height:50%; box-shadow: 0 0 10px black; margin-left:25%; margin-top:13%; } #centralident img{ max-height:100%; }

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• Why does unity obj import flip my x coordinate?

  - by milkplus

  When I import my wavefront obj model into unity and then draw lines over it with the same coordinates in the obj file, the x coordinate is negated. I don't see any option in the importer that might be doing that. And I'm using the same localToWorldMatrix and the same coordinate data in the .obj file. Hmmm GL.PushMatrix(); GL.MultMatrix(transform.localToWorldMatrix); CreateMaterial(); lineMaterial.SetPass(0); GL.Color(new Color(0, 1, 0)); GL.Begin(GL.LINES); GL.Vertex(p1); GL.Vertex(p2); GL.Vertex(p2); GL.Vertex(p3); //... GL.End(); GL.PopMatrix();

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• Why values in my WCF data contract were suddenly wrong...

  - by mipsen

  A WCF Service I provided took a very simple data contract as parameter (containing one string and one int...) and had a very simple task to do. A .NET 3.5 client was created using the VS2008 feature "Add Service Reference". Everything worked as expected. Then a slight change came in: The client was expected to run on machines with .NET 2.0 only. So we set the Target  Framework to .NET 2.0, removed the references to System.ServiceModel, System.Runtime.Serialization and the ServiceReference and created a new Reference to the Service using the old "Add Web Reference" . A matter of 2 minutes.  When testing, the int value in the data contract arriving at the WCF Service suddenly was 0, instead of 38 as we expected. What happened? When generating an old  Web Reference on a WCF data contract an additional boolean field for each value-type field is created called [Fieldname]Specified (e.g. AgeSpecified) which defaults to "false". WCF inspects these boolean fields to determine if a value was provided for the value-type field. If the "Specified"-field is "false", WCF translates that to using the default-value of the value-type field. For int this is 0. So we had to insert  setting the "Specified"-field  for the int-value to "true" and everything was fine again. That was what we forgot after setting the Framework-version to 2.0...

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• Why does my mic boost automatically go to 100 on every boot?

  - by Ben

  When my computer turns on, it automatically sets the "mic boost" sound setting to 100. This causes a loud static sound in my speakers. I can manually go to alsamixer and turn the mic boost down manually, but I would prefer it if I didn't have to do this every time I turn the computer on. I've tried running sudo alsactl store after fixing the settings, and this does save them, but I have to run sudo alsactl restore to restore the settings. This means that I have to manually fix the sound every time I start the computer anyway, so it isn't really a fix. I tried putting sudo alsactl restore in my startup programs, but that didn't seem to fix anything. I'm running Ubuntu 12.04, but I started having this problem before upgrading from 11.10. I'm using a Sony Vaio laptop. I'm not really sure what made it start; it seemed like I just started having the problem randomly one day. Any help would be appreciated! Edit: here is the output from running amixer: http://paste.ubuntu.com/1060080/

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• Why I loose my page rank after 301 redirect?

  - by rajesh.magar

  As we all know Google treat sub-domain as completely separate domain so we have to fight for both, to get ranked in search results. Right! So one of my client website was like they having "example.com" and "Blog.example.com". So in mind to keep all stuff in one place we redirect "blog.example.com" to "example.com/blog/" But in this case we where loose our pagerank and still wondering where we went wrong or it just take few more time to showoff. so what is the reason behind this will be. Thanks in advance.

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