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• Raspberry Pi, Time Capsule Progress

  - by Richard Jones

  So by way of an update. I thought all was good with my Raspberry Pi, Debian and Netatalk Apple Time Capsule Clone. However something very strange going on. Although I could backup my Mac's + PC's fine to Raspberry Pi with external USB HD; strangely with RPI running, I couldn't use AirPlay. I found myself unable to play anything from Mac to Apple TV. So after lots of trying to make this work, I about turned and finally went out and got myself a 2TB Apple Time Capsule. More cash than I would want to spend on anything like this, but Apple you got me. I would like to offer a top tip, which maybe goes a small way to justifying silly expenditure... You can easily add a USB HD to any Time Capsule. I've just added a 3 TB external USB HD, giving me a 5 TB of total backup grunt. 3 TB External USB HD, was peanuts by comparison to Apple kit. So all working, its all solid as you'd expect.Apple 2, maybe me .5. But strong, solid backups now happening, without hassle (but a bit of a credit card bill to follow)

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• Building own kernel on ubuntu

  - by chris

  Hi, I'm trying to build my own kernel, as I want to write a kernel program which I need to compile into the kernel. So what did I do? Download from kernel.org, extract, do the make menuconfig and configure everything as needed, do a make, do a make modules_install, do a make install and finally do a update-grub. Result: It doesn't boot at all.... Now I had a look here and it describes a different way of compiling a kernel. Could this be the reason whz my way did not work? Or does anyone else have an idea why my kernel doesn't work? ######## Edit Great answer, ty. Oli. But I tried it the old fashioned way, and after one hour of compiling I got this message: install -p -o root -g root -m 644 ./debian/templates.master /usr/src/linux-2.6.37.3/debian/linux-image-2.6.37.3meinsmeins/DEBIAN/templates dpkg-gencontrol -DArchitecture=i386 -isp \ -plinux-image-2.6.37.3meinsmeins -P/usr/src/linux-2.6.37.3/debian/linux-image-2.6.37.3meinsmeins/ dpkg-gencontrol: error: package linux-image-2.6.37.3meinsmeins not in control info make[2]: *** [debian/stamp/binary/linux-image-2.6.37.3meinsmeins] Error 255 make[2]: Leaving directory `/usr/src/linux-2.6.37.3' make[1]: *** [debian/stamp/binary/pre-linux-image-2.6.37.3meinsmeins] Error 2 make[1]: Leaving directory `/usr/src/linux-2.6.37.3' make: *** [kernel-image] Error 2

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• TCP/IP performance tuning under KVM/Qemu

  - by vpetersson

  With more and more companies switching to public cloud services, I'm curious what you guys' thoughts are on TCP/IP tuning in the cloud. Is it worth bothering with? Given that you don't have access to the host-server, you're somewhat limited I presume Let's say for the sake of the argument that you're running three MongoDB-servers in a replica-set on FreeBSD or Linux that all sync over an internal network. I'd also be curious if anyone made any actual performance benchmarks to back up their arguments. I benchmarked the various network drivers available for KVM/Qemu here, but I'm curious what the gurus here suggest to tune further. I started playing around a bit with the tuning-recommendations as suggested over here, but interestingly enough I saw a decrease in performance, rather than an increase, but perhaps I didn't fully understand the tweaks. Update: I did a few more benchmarks and posted the result here. Unfortunately the result wasn't really what I expected.

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• JBox2D applyLinearImpulse doesn't work

  - by Romeo

  So i have this line of code: if(input.isKeyDown(Input.KEY_W)&&canJump()) { body.applyLinearImpulse(new Vec2(0, 30), cam.screenToWorld(body.getPosition())); System.out.println("I can jump!"); } My problem is that the console display I can jump! but the body doesn't do that. Can you explain to me if i do something wrong? Some more code. This function creates my 'hero' the one supposed to jump. private Body setDynamic(float width, float height, float x, float y) { PolygonShape shape = new PolygonShape(); shape.setAsBox(width/2, height/2); BodyDef bd = new BodyDef(); bd.allowSleep = true; bd.position = new Vec2(cam.screenToWorld(new Vec2(x + width / 2, y + height / 2))); bd.type = BodyType.DYNAMIC; bd.userData = new BodyInfo(width, height); Body body = world.createBody(bd); body.createFixture(shape, 10); return body; } And this is the main update loop: if(input.isKeyDown(Input.KEY_A)) { body.setLinearVelocity(new Vec2(-10*delta, body.getLinearVelocity().y)); } else if (input.isKeyDown(Input.KEY_D)) { body.setLinearVelocity(new Vec2(10*delta, body.getLinearVelocity().y)); } else { body.setLinearVelocity(new Vec2(0, body.getLinearVelocity().y)); } if(input.isKeyDown(Input.KEY_W)&&canJump()) { body.applyLinearImpulse(new Vec2(0, 30), body.getPosition()); System.out.println("I can jump!"); } world.step(delta * 0.001f, 10, 5); }

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• Offset AND incremental backup

  - by Pyrolistical

  I already do backups from my main computer to my server computer using synctoy. But now I also want to do off-site backup. My idea so far: have source hard drive (we'll call S) at home have backup hard drive at work called B have transport hard drive called T connect T at work and record index of files on B take T home and check index of S and note new/changed/deleted files and copy changed files to T take T to work and update S repeat Its basically a sneakernet and using all of the advantages of it. High bandwidth, low latency. Is there some software to do this, or do I have to write it myself?

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• Start frei für die Exadata Community im neuen Look!

  - by Frank Schneede (Exadata Community)

  Endlich ist es soweit! Pünktlich mit dem Start der DOAG Konferenz 2012, die vom 20.11. - 22.11.2012 in Nürnberg stattfindet, geht die Deutsche Exadata Community in völlig neu gestaltetem Outfit an den Start. Sie werden hier regelmäßig über neue Ankündigungen sowie Tipps und Tricks im Umgang mit Exadata informiert. Durch das freiere Blogformat werden an dieser Stelle auch Berichte über Exadata Projekte erscheinen, die besonders hervorhebenswert sind. Ich denke, Sie dürfen gespannt sein! Vieles hat sich seit dem letzten Update in der Community getan, denn auf der diesjährigen Oracle Open World in San Franzisco wurde eine ganze Reihe spannender Ankündigungen rund um Exadata gemacht. Die kürzlich vorgestellten Modelle Exadata Database Machine X3-2 und X3-8 sind in der grundlegenden Architektur zwar unverändert geblieben, jedoch sind die Modelle mit aktuellen Prozessoren in SandyBridge Mikroprozessorarchitektur noch leistungsfähiger als bisher. Der vierfach vergrößerte Flash Cache nimmt wesentlich mehr Daten auf und macht die Exadata so zur "In-Memory" Database Machine. Mit der neuen Exadata Software 11.2.3.2 kann der Flash Cache nun als persistenter Write Back Flash Cache verwendet werden. Durch das neuartige Caching profitieren auch OLTP Applikationen, die eine hohe Last von schreibenden Transaktionen verursachen, stärker von der Exadata Technologie. Ein neues Einstiegsmodell, das Exadata X3-2 Eighth Rack, vervollständigt die Produktfamilie und senkt abermals die Einstiegshürde für die Kunden.  Die beiden Community Tipps zur Exadata Hardware wurden aktualisiert. Lesen Sie alles über die Exadata Database Machine X3-2 und deren große Schwester, die Exadata Database Machine X3-8.

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• ASP.NET MVC 3 (C#) Software Architecture

  - by ryanzec

  I am starting on a relatively large and ambitious ASP.NET MVC 3 project and just thinking about the best way to organize my code. The project is basically going to be a general management system that will be capable of supporting any type management system whether it be a blogging system, cms, reservation system, wikis, forums, project management system, etc…, each of them being just a separate 'module'. You can read more about it on my blog posted here : http://www.ryanzec.com/index.php/blog/details/8 (forgive me, the style of the site kinda sucks). For those who don't want to read the long blog post the basic idea is that the core system itself is nothing more than a users system with an admin interface to manage the users system. Then you just add on module as you need them and the module I will be creating is a simple blog post to test it out before I move on to the big module which is a project management system. Now I am just trying to think of the best way to structure this so that it is easy for users to add in there own modules but easy for me to update to core system without worrying about the user modifying the core code. I think the ideal way would be to have a number of core projects that user is specifically told not to modify otherwise the system may become unstable and future updates would not work. When the user wants to add in there own modules, they would just add in a new project (or multiple projects). The thing is I am not sure that it is even possible to use multiple projects all with their own controllers, razor view template, css, javascript, etc... in one web application. Ideally each module would have some of it own razor view templates, css, javascript, image files and also need access to some of the core razor view templates, css, javascript, image files which would is in a separate project. It is possible to have 1 web application run off of controllers, razor view templates, css, javascript, image files that are store in multiple projects? Is there a better was to structure this to allow the user to easily add in module with having to modify the core code?

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• Java: How to Make a Player Class in a Tile-Based RPG

  - by A.K.

  So I've been following a JavaHub tutorial that basically uses a pixel engine similar to MiniCraft. I've attempted to make a Player Class as such, and I'm basically making a mock Pokemon game for learning's sake: package pokemon.entity; import java.awt.Rectangle; import pokemon.gfx.Screen; import pokemon.levelgen.Tile; import pokemon.entity.SpritesManage;; public class Player { int x, y; int vx, vy; public Rectangle AshRec; public Sprite AshSprite; Screen screen; Sprite[][] AshSheet; public Player() { AshSprite = SpritesManage.AshSheet[1][0]; AshRec = new Rectangle(0, 0, 16, 16); x = 0; y = 0; vx = 1; vy = 1; screen.renderSprite(0, 0, AshSprite); } public void update() { move(); checkCollision(); } private void checkCollision() { } private void move() { AshRec.x += vx; AshRec.y += vy; } public void render(Screen screen, int x, int y) { screen.renderSprite(x, y, AshSprite); } } I guess what I really want to do is have the Player centered in the screen and have the sprite drawn based on an Input Handler. I'm just stumped as to how to sync these together.

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• Samba as a PDC and offline authentication

  - by Aimé Barteaux

  Say I have a Windows laptop which has been connected to a domain. The domain has a Samba server as a PDC. Now say that I move the laptop outside of the network (the network is completely inaccessible). Will I be able to logon into accounts I have accessed before on the laptop (through GINA)? Update: Looking at the smb.comf documentation I noticed the setting winbind offline logon: This parameter is designed to control whether Winbind should allow to login with the pam_winbind module using Cached Credentials. If enabled, winbindd will store user credentials from successful logins encrypted in a local cache.. To me it looks like this solves the issue but can anyone else confirm it and/or point out if any additional values need to be set?

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• VisualSVN Server , Windows 7 and Apache Problem

  - by Ash

  I am running Visual SVN Server(with Apache) on a Windows 7 computer and network. After about 15-20 minutes of my first commit/update, I am unable to access the repository via Tortoise SVN. The error message I get is: OPTIONS of "https://jason/svn/repository1": could not connect to server (https://jason) Restarting the Visual SVN Server service helps sometimes but fails quite often. The only sure-shot way to get it working is to restart the computer. The server - https://jason is also not accessible via the browser when I get this error 1) I tried reinstalling Windows 7, Visual SVN server and Tortoise SVN but I still keep getting this error. 2) I searched several forums but I dont seem to be able to find an answer. Please help.

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• Basic 3D Collision detection in XNA 4.0

  - by NDraskovic

  I have a problem with detecting collision between 2 models using BoundingSpheres in XNA 4.0. The code I'm using i very simple: private bool IsCollision(Model model1, Matrix world1, Model model2, Matrix world2) { for (int meshIndex1 = 0; meshIndex1 < model1.Meshes.Count; meshIndex1++) { BoundingSphere sphere1 = model1.Meshes[meshIndex1].BoundingSphere; sphere1 = sphere1.Transform(world1); for (int meshIndex2 = 0; meshIndex2 < model2.Meshes.Count; meshIndex2++) { BoundingSphere sphere2 = model2.Meshes[meshIndex2].BoundingSphere; sphere2 = sphere2.Transform(world2); if (sphere1.Intersects(sphere2)) return true; } } return false; } The problem I'm getting is that when I call this method from the Update method, the program behaves as if this method always returns true value (which of course is not correct). The code for calling is very simple (although this is only the test code): if (IsCollision(model1, worldModel1, model2, worldModel2)) { Window.Title = "Intersects"; } What is causing this?

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• Wrong screen resolution with HDMI output to HDTV

  - by bruno077

  I own an HDTV with a native resolution of 1360x768. Sometimes I plug in my laptop to watch movies, and I used to do it with a VGA cable. I've had no problem setting the laptop to the TV native resolution with the VGA cable (1360x768). Having acquired an HDMI cable recently, I can't go past 1280x720, and if I do, the TV displays "invalid format". At 1280x720, the image is viewable but not centered, so for example I can't see the windows taskbar or titlebars. I've tried both cables (VGA and HDMI) with the same settings: Laptop's display turned off and trying to set the Tv's native resolution. What could I try to fix this issue? Could it be a faulty cable? (I'm using a Thinkpad with Windows 7) EDIT: My graphics adapter appears listed as Mobile Intel(R) 4 Series Express Chipset Family (Searching for my laptop's model yields Intel GMA 4500MHD as the graphic card) I'm downloading a driver update from Intel's website. I'll report my progress when I check its behavior tomorrow.

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• Ubuntu 12.04.1 LTS and Nvidia dirver (304.51) 64bit: problem 640x480

  - by nibianaswen

  I have a problem with this configuration: Asus K55V, Ubuntu 12.04 LTS and Nvidia driver 304.51. I have remove the nouveau driver with: apt-get --purge remove xserver-xorg-video-nouveau I installed the official nvidia driver (from www.nvidia.com) but when I reboot the PC the resolution of screen is only 640x480 and the monitor is resized. Mo solution at this problem if i change the xorg.conf. Now i have uninstall the nvidia driver and reinstall with sudo apt-get purge nvidia-current sudo apt-add-repository ppa:ubuntu-x-swat/x-updates sudo apt-get update sudo apt-get install nvidia-current When I reboot the screen resolution and size is OK, but if I start nvidia-setting I received the message: You do not appear to be using the NVIDIA X driver. and with command: sudo lshw -c display | grep driver I received configuration: driver=i915 latency=0 This sound like the system is using the Intel card. When I launch command lspci | grep VGA the output is: 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation Device 1058 (rev ff) And there is no /etc/X11/xorg.conf. I have read a lot of guides on internet but without success.. How i can use nvidia card with the driver that i have installed?

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• My iPhone is stuck at screen with USB cable and iTunes logo

  - by alex

  I just tried updating the iPhone's firmware, and things went haywire. iTunes informed the update had failed and linked me to this page. The iPhone is stuck on the image from the top of that page. I held down the sleep and home buttons until it turned off and turned it back on, and then went through the iPhone's 'restore' mode. It then error'd again and I'm stuck back with the logos on the iPhone. Does anyone know how to fix this? Thanks

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• How can I copy the output from a remote command into the local clipboard?

  - by cwd

  I use iTerm2 as my terminal client in Mac OS X. On the local system I can use pbcopy and pbpaste to transfer data between the system clipboard and the terminal, but of course this doesn't work when you're ssh'ed to another machine. Is there some way which I can take the result of a command and copy it to the clipboard automatically? Perhaps an applescript to grab the text on the iTerm windows, then get the next to last line? For instance, if I wanted to copy the current working directory: I run pwd, then use the mouse to select the text, and then press command + c. Is there any better / faster / automatic way of doing this? I'm not looking for a bulletproof solution that would work for every command (eg: might not work when there is a huge scrollback) - I'm just looking for something to make this task that I do quite often a little less tedious. Update I'm looking into using screen to do this, but I'm still not sure if it is possible.

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• How do I get the best quality screenshot for OCR (Optical Character Recognition) and what tool would

  - by GiH

  I'm trying to get some data into a text file from screenshots. Apparently screenshots don't work very well with OCR because they are 75dpi and the minimum for good quality OCR is 150dpi. Does anyone know how what the best way to be taking screenshots for OCR would be? And also, what the best OCR software for doing this would be? Right now I'm getting pretty good results with the free online tools such as new-ocr but it does make mistakes that I have to correct every now and then. So I'd like some tips. UPDATE: I tested out ABBYY screenshot and it was pretty bad... the online tools are better

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• How do I change the wallpaper of Windows 7 Starter Edition?

  - by V. Schreiber

  Is there a way to change the desktop wallpaper in Windows 7 Starter Edition? I wanted to do that on my new netbook, just to find out that there is no "Customize" option in the control panel. Microsoft obviously wants to keep the netbook users rather rigidly from customizing their machines. It isn't even possible to edit the picture itself in the C:\Windows\Web\Wallpaper\Windows\ directory, due to lack of rights. From what I can tell only the user "Trusted Installer" would have enough rights to do so... Update: With your help I found two programs that are able to bypass Microsoft's limitations: Starter Wallpaper Changer (Thanks to Sopan and javier. I'm using this program now) Wallpaper Changer for Windows 7 (Thanks to Sathya) (This one was taken down for EULA limitations)

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• Mountain Lion screen crashes after returning from sleep

  - by Aron Rotteveel

  During the past 3 days I have experienced the following issue: when returning from sleep, I see an extremely garbled version of my desktop. The only thing that seems to help is a reboot. My first guess is that this is related to the video card. After looking into this issue, I found a lot of problems related to ML and returning from sleep, such as this post on AskDifferent, but I think this is a different issue because it does not speak of a garbled screen. Some more details: System: MacBook Pro 15" early 2011, 2,2GHZ I7, 8GB Ram, AMD Radeon HD6750M 1024 The issue seems to happen only when I open my laptop in the morning; if I close and open my laptop during the day, it does not seem to happen. The issue 'solves' when rebooting. Photo of how this looks: Update November 27th 2012: I re-installed my laptop a couple of weeks ago, which seemed to have solved the problem, but sadly, it still persists.

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• wrong kernel running after install

  - by ticktockhouse

  I have installed Ubuntu 14.04 from unetbootin. When it reboots after the install, uname -r says: 3.5.0-17-generic ..this means that no modules have loaded for the kernel that is actually installed (3.13.0-32-generic). Does anyone know why this kernel should be installed via the install process? Is it an artifact of using Unetbootin? Booting into the Unetbootin image gives the correct kernel, and thus the modules load. Knowing why is one thing, but I'm not sure how to remedy it now. Because no modules are loaded, I can't connect to the network or connect a USB drive. I've tried update-grub, which seems to find the correct kernel, but doesn't seem to tell the system to boot from it. I've also tried selecting the kernel at boot time using the "Advanced Options for Ubuntu", and the 3.13.x kernel is the only one listed. Selecting this lead to the 3.5.x kernel stubbornly loading.. I'm a fairly accomplished sysadmin, but this one has me flummoxed :) Can anyone help?

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• Performance issues with new dedicated server [closed]

  - by Pierre Espenan

  I have just subscribed to a new dedicated server and am getting worst than expected PHP execution performance. Execution times are twice as high as on my old mutualized server! I'm definitely not an expert at server management, so I'm wondering what I missed. Here are some stuff that can help you understand what's wrong here : My server (in french but easy to understand) : http://www.online.net/fr/serveur-dedie/dedibox-sc phpinfo(); output : http://jsfiddle.net/E8b7W/embedded/result/ PHP bench script (dedicated server) : http://jsfiddle.net/EhXzK/embedded/result/ PHP bench script (old mutualized) : http://jsfiddle.net/ANbWt/embedded/result/ Is it normal to get such poor performances after a kernel update and basics "apt-get install" for apache2 and php ? Thanks !

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• Very fast Laptop Heating due to very high CPU usage by dwm.exe

  - by Sushan Shrestha

  My laptop gets heated very fast and when I check the task manager, I find dwm.exe consuming very high CPU (mostly 100%). In the beginning I found the message "The graphic adapter has been stopped and recovered".Also I am getting one error message "Cidaemon.exe has stopped working" very frequently. During this period also, cpu usage is 100% which is consumed by dwm.exe. I have run ccleaner and Kingsoft PC doctor monitor to fix the register problem but the problem has not been solved. My display adaptor is : NVIDIA NVS 5200M. After the driver update, I am not getting "The graphic adapter has been stopped and recovered" but dwm.exe is still consuming 100% CPU one time in about 5 mins. Multiple restarts has not helped. Laptop Model: Dell Latitude E6430. Thanks in advance.

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• Excel: What formula combines this data into one COUNT amount?

  - by Mike

  I have 30 colleagues who are answering questions over 3 time periods. Each has their own Excel workbook with the questions, and over the year they update it. I collate their worksheets into one master worksheet, but now need to combine their answers into a simple table. The questions, the time periods and then a COUNT of how many answered it. For example: I need a table that shows me how many people (not the persons name at this point) answered question 10 in time period 2. I can't use a database before someone mentions it ;). Many thanks Mike.

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• How to fill sequence in Excel from ranges given in another sheets?

  - by amyassin

  I have an Excel sheet where two columns (say J and K) among data in sheet1 are as follows: J ------------ K 1 ----------- 25 26 --------- 50 101 ------ 150 Which are some ranges. I have another sheet where I have column (let's say I), which I want to update it to have the values as indicated by the range; i.e. column values of I to be 1,2,3,...25,26,27,...50,101,102,103,...150 (vertically). Note that ranges in J-K are not always continuous (e.g. gap between 50 and 101) and not always in the right order. I'm trying to find some automated way to achieve that, instead of manually copying the starting value of the range (from I) and then dragging down sequentially until the ending value (from J) for every individual I and J value, which is a very huge set of data. Is there any way to help doing that? Note: I'm using Microsoft Excel 2013, but a solution for excel 2010 or 2007 is more than welcomed...

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• Sql Server 2008 Create Foreign Key Manually

  - by tgriffiths

  I have inherited an old database which wasn't designed very well. It is a Sql Server 2008 database which is missing quite a lot of Foreign Key relationships. Below shows two of the tables, and I am trying to manually create a FK relationship between dbo.app_status.status_id and dbo.app_additional_info.application_id I am using SQL Server Management Studio when trying to create the relationship using the query below USE myDatabase; GO ALTER TABLE dbo.app_additional_info ADD CONSTRAINT FK_AddInfo_AppStatus FOREIGN KEY (application_id) REFERENCES dbo.app_status (status_id) ON DELETE CASCADE ON UPDATE CASCADE ; GO However, I receive this error when I run the query The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_AddInfo_AppStatus". The conflict occurred in database "myDatabase", table "dbo.app_status", column 'status_id'. I am wondering if the query is failing because each table already contains approximately 130,000 records? Please help. Thanks.

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• How do I rescue files from the encrypted home folder via live USB stick?

  - by Alexia

  I know, this has been asked and answered all over the internet already. However, I start feeling stupid, since the informations there are not helping me. Just this morning, I wanted to install the newest update to 13.10. After the download, when it came to the actual installing, the install program froze and didn't do anything for hours. At that time, I was still logged in. The computer was working and everything was accessable to me. However, I made the mistake and didn't immediately make safety copies of everything. Instead, I just rebooted. Long story short: My computer even fails to reset to a previous version via Grub. But I am able to boot from a USB stick and, after starting Nautilus, I see my home folder on the HD. I would now like to copy its contents onto an external harddisk. Problem 1: I have no rights to access the folder like that. Problem 2: It is encrypted. Problem 3: I don't know how to give myself the rights to access the folder nor do I know how to encrypt it. I assume that it might help that I still know these things: - my old login name - my old login phrase - a 32 characters long string of hexadecimal numbers that I copied to my list of passwords as "Ubuntu Encryption Code". I copied it digitally right after installing Ubuntu the first time and encrypting the home folder, so there won't be any typos. I am sure of that. The solutions that I saw so far, tell me that I need the "encryption phrase". But when I follow the instructions and use this phrase that I have in my list, I only get messages of denial. Can anyone help me through this special problem, please?

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