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• How do I set up a server for SSH?

  - by Rob S.

  At my workplace (a university) we have two Ubuntu servers. One is a teacher server and the other is a student server. I am currently setting up a new server to replace the existing teacher server. The new server is currently online and I am trying to get it setup so I can SSH into it from my home. Right now, I can SSH into the existing teacher or student server and then SSH into the new server. However, I can not SSH directly into the new server. What must I do so that I can SSH directly into the new server? Thank you very much in advance for your time.

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• Ubuntu 12.04 crashes on startup for newer versions of Linux, possibly related to WiFi

  - by Jake

  My computer gets to the screen with the Ubuntu logo and the orange/white dots, and then the screen goes black, spits out a lot of error messages, and cannot boot. (If it'd be helpful, I can take a photo of my screen in this state.) I've found I can successfully boot if my wireless card is turned off. As soon as I turn it on, my computer crashes with the same black screen of death. I can also successfully boot if I choose "Previous Linux Version" and select a few versions back (I think 3.0.6). Here are some relevant details about my setup: Ubuntu 12.04 Computer: Lenovo x230 Wireless: Realtek RTL8188CE 802.11b/g/n WiFi Adapter Processor: Intel Core i5-3210M CPU @ 2.50GHz × 4 RAM: 16 GB of RAM Thank you!!!

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• 2D Ragdoll - should it collide with itself?

  - by Axarydax

  Hi, I'm working on a ragdoll fighting game as a hobby project, but I have one dilemma. I am not sure if my ragdoll should collide with itself or not, i.e. if ragdoll's body parts should collide. 2D world is somewhat different than 3D, because there are several layers of stuff implied (for example in Super Mario you jump through a platform above you while going up). The setup I'm currently most satisfied with is when only the parts which are joined by a joint don't collide, so head doesn't collide with neck, neck with chest, chest with upper arm etc, but the head can collide with chest, arms, legs. I've tried every different way, but I'm not content with either. Which way would recommend me to go?

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• Blank screen when "boot from USB"

  - by Nathan

  OK so, here is what I have done: I downloaded the iso "ubuntu-12.04-desktop-amd64" I used "Universal-USB-Installer-1.9.0.0" to make a bootable USB I restart PC and change the boot option to USB HDD I get the menu to: Boot from USB Install to Hard drive Help etc When I click Boot from USB or Install to hard drive, loads of text flies past and then I get a blank screen and I cant see anything? What can I do so I can see the installation screen? Im using a dual monitor setup from my GFX card and my main display is on my HDMI port to my TV.

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• Recommendations for a quick and easy discussion forum installation

  - by BeachRunnerJoe

  Hello. I did a couple quick searches on this topic and both Google and this site yielded poor results, but I was wondering what's the quickest way to setup a discussion forum on my website. Preferably one that has a decent Admin dashboard. My website is very static (e.g. it has one index.html, a stylesheet, and a javascript) and it will most likely be hosted on GoDaddy.com. The last time I installed a discussion forum was six years ago and it was phpBB. I'm sure that's still an option, but I'm (hoping) wondering if there are better, free, and as-easy alternatives to phpBB. Thanks for your wisdom!

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• memory and time intensive php task

  - by Goddard

  Sorry if this question has been asked before, but I couldn't find anything usable. I'm working on a project for a client and currently I have to loop through the users table which is about 3000 records and still growing. I have to do some calculations on a nightly basis which I am going to be using cron/php. The calculations script uses about 3.5mb of memory and takes about 1 second to run. When loading individual users my current php setup handles this fine, but if I try and loop through the user list my php script execution time runs out. I've read after doing some searching that I can make the page reload itself after each user calculation and just keep my previous place in the loop and this sounds like a good idea, but I wanted to hear some opinions from others that have handled similar situations and how you handled these types of tasks. Thanks.

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• Why is my Workspace switcher view skewed

  - by Lee

  I have been using Workspace switcher in Ubuntu just fine but recently have encountered this problem. The windows in the switcher don't fill the screen. I must have pressed some combination of buttons somehow but can't find any information anywhere in regards to resizing them. As you can see in the screen shot it looks like a perspective view or something. http://i1115.photobucket.com/albums/k553/lmt337/Screenshotfrom2012-07-04103519.png I should also add I have a dual monitor setup and nvidia graphics. The switcher still works but the fact the screens dont fit my actual screens is driving me nuts. Thanks in advance for any help.

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• Upload Recordings Of The Problem To Your SR

  - by Irina

  Do you find yourself trying several times to explain a problem in a Service Request? Does the support engineer ask more than once for clarification? If so, you might be interested in DITO -- Demo It To Oracle. DITO uses CamStudio (free download!) to record the exact nature of the problem, and upload the output to your SR. The following articles provide more details: Working with Support - MOSSOS (Doc ID 1265130.1) "Demo It To Oracle" (DITO) - CamStudio Help ( Doc ID 11.1) Why take up valuable time first explaining the problem, then trying to get a web conference setup to show exactly what is going on? The next time you file an SR, try including a recording showing exactly which application is failing, where it is failing, and what it looks like when it fails.

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• Nvidia Fullscreen Metanode "Sliding" Issue

  - by user68202

  i have 2 monitors, the left one is my "main" monitor with 1920x1080_120, the right one my second with 1680x1050_60. (i have a nvidia card setup with twinview) when i play a game or something in fullscreen mode, the full resolution is used in fullscreen (monitor 1 + monitor 2). i read something about the metanodes i can use to shut down the one monitor that i dont need durning a "fullscreen session". i used the following: Option "metamodes" "DFP-0: 1920x1080_120 +0+0, DFP-2: 1680x1050_60 +1920+0; DFP: 1920x1080_120 +0+0, NULL" Its working great, the second (right) monitor is shutting down when i press "CTRL ALT +" and is starting agin when i press the same keystroke. But in the second mode when the second monitor is "down", i got the full "monitor 1 + monitor 2" resolution on my first (left) monitor, i can move my mouse to the right to see the contents of the second monitor and move it again to the left to the what is normally seen on the first monitor. Its something sliding between the 2 monitors on one display. How can i avoid this?

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• Implementing Ads on any page in your Windows 8 XAML app–part 1

  - by nmarun

  Let’s look at how you can implements ads on any page in your win 8 app. Before you get to your application, you need to create Ad Units in the MS Pubcenter site. Once you have set up your account with payout and tax details, go to the Setup tab and you’ll see something like below. There are a few options for the sizes of the ad units as shown on the Pubcenter site. Remember that these screenshots are just to give you some reference. The actual positioning of the ads in your apps is decided by you...(read more)

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• Need a Holistic view of your Concurrent Processing? Choose CP Analyzer

  - by user793044

  The Concurrent Processing Analyzer is a Self-Service Health-Check script which reviews the overall Concurrent Processing Footprint, analyzes the current configurations and settings for the environment providing feedback and recommendations on Best Practices. This is a non-invasive script which provides recommended actions to be performed on the instance it was run on.  For production instances, always apply any changes to a recent clone to ensure an expected outcome. Benefits include: E-Business Applications Concurrent Processing Analyzer Overview E-Business Applications Concurrent Request Analysis E-Business Applications Concurrent Manager Analysis Identifies Concurrent System Setup and configurations Identifies and recommends Concurrent Best Practices Easy to add Tool for regular Concurrent Maintenance Execute Analysis anytime to compare trending from past outputs Go to Doc ID 1411723.1 for more details and script download. Feedback welcome!

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• Windows 7/ 12.04 Dual Boot Mess

  - by Ben

  I am certainly new to ubuntu (linux in general)... I added ubuntu 12.04 as a dual boot to a brand new desktop which had win 7 pre-installed. Both work well Then I tried to change the order of the boot menu to make Ubuntu first and Win7 second... I did this from the windows side (it seems that my setup is relying on windows bootloader, which I don't think I need to change) using the built-in startup manager (I think that's what windows calls it- it's in the control panel). I set Ubuntu as first (default if no user input). then... I ACCIDENTALLY ("hmmm...I wonder what this button does?") set the menu timeout to "0" Now, I cannot change the menu timeout (because I cannot get into windows) and without doing so, I cannot select windows as the OS I would like to boot(I cannot get into windows). Any Ideas?

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• Network printer gets disabled occasionally

  - by Yossi Farjoun

  I'm running Ubuntu 10.04 and have a HP-Laserjet-3005P network printer. Occasionally (perhaps related to rebooting) the printer, which is setup as the default printer, becomes disabled. After realizing that I'm not getting anything printed, I must then open printing preferences and click on "enabled". Then it prints happily until the next time that it becomes disabled... Any ideas why this is happening and/or how I could fix it? I know I'm giving very little information, I can't think of anything else to give...if there's something I should be providing, please let me know.

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• Cannot mount USB disks due to "not authorized" error

  - by shadovv

  I have Ubuntu 12.04 (.2?) installed. I don't plan to need GUI after setup so I modified the grub to start in console. However, whenever I want to start up GUI I need to type startx. Simple/basic stuff. However I seem to be hitting a snag: I am having trouble mounting/accessing USB flash drives in the GUI I started in the console. "Unable to mount location - not authorized". Seemed like it should be an easy fix, but can't figure out how I'm overlooking it. Can someone help me out?

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• April 24 Webcast: Procurement: How to Solve Errors with Receiving Transactions

  - by Oracle_EBS

  ADVISOR WEBCAST: How to Solve Errors with Receiving TransactionsPRODUCT FAMILY: E-Business : Procurement April 24, 2012 at 14:00 UK / 15:00 CET / 06:00 am Pacific / 7:00 am Mountain / 9:00 am Eastern/ 3:00 pm Egypt Time Session description that sets customer expectations such as This one-hour session is recommended for technical and functional users need to know about verifying the receiving transactions errors, troubleshoot it and fix it from the application forms and the back-end. TOPICS WILL INCLUDE: Setup and normal transactions The cause of (RVTTH-115B, RVTTH-115D, RVTTH-115F, RVTTH-115H, RVTTH-115J) and how to identify it The troubleshooting and solution of this issue in a non WMS org The solution of this issue in WMS org A short, live demonstration (only if applicable) and question and answer period will be included. Oracle Advisor Webcasts are dedicated to building your awareness around our products and services. This session does not replace offerings from Oracle Global Support Services.   Current Schedule can be found on Note 740966.1 Post Presentation Recordings can be found on Note 740964.1

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• Using 'new' in a projection?

  - by davenewza

  I wish to project a collection from one type (Something) to another type (SomethingElse). Yes, this is a very open-eneded question, but which of the two options below do you prefer? Creating a new instance using new: var result = query.Select(something => new SomethingElse(something)); Using a factory: var result = query.Select(something => SomethingElse.FromSomething(something)); When I think of a projection, I generally think of it as a conversion. Using new gives me this idea that I'm creating new objects during a conversion, which doesn't feel right. Semantically, SomethingElse.FromSomething() most definitely fits better. Although, the second option does require addition code to setup a factory, which could become unnecessarily compulsive.

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• Site overthrown by Turkish hackers...

  - by Jackson Gariety

  Go ahead, laugh. I forgot to remove the default admin/admin account on my blog. SOmebody got in and has replaced my homepage with some internet graffiti. I've used .htaccess to replace the page with a 403 error, but no matter what I do, my wordpress homepage is this hacker thing. How can I setup my server so that ONLY MYSELF can view it while I'm fixing this via .htaccess? What steps should I take to eradicate them from my server? If I delete the ENTIRE website and change all the passwords, is he completely gone? Thanks.

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• How to add a command permanently to grub2

  - by tomodachi

  I have a fairly special setup, using Linux on a MacBook Laptop. to switch off my secondary graphics card in it I'm required to add these lines to my grub outb 0x728 1 outb 0x710 2 outb 0x740 2 outb 0x750 0 I do this by pressing 'e' for my selected grub menu option and adding the lines one by one . then finally booting . But as we know it's not permanent. I cant really figure out where i need to add it for grub to always append it to my Linux boot options. It's doesn't seem to belong in /etc/default/grub since here i can add stuff to the kernel boot line Honestly i'm afraid to fiddle to much with grub on my computer since getting it to triple boot Linux/Mac/Windows was a very delicate and timely matter. Does anyone have any idea of where to add it?

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• I try install dhcp3-server, but /etc/init.d/dhcp3-server file is missing. Whats going on?

  - by hydroparadise

  I've found several how-to's that essentially go through the same process in setting up DHCP. Here's a link that has the list of step needed install and setup DHCP. I follow all the steps and find that the sudo /etc/init.d/dhcp3-server restart portion returns command not found only to reveal the the file doesn't even exist. I've installed (sudo apt-get install dhcp3-server) and uninstalled (sudo apt-get remove dhcp3-server) two or three times. I'm pretty sure my config files are good because I've had to check them three times. But I don't think I'm to that point of being able to see them action it. I cant control the process. Why is the file missing? How is it supposed to get there? Help?

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• Mouse pointer hides at bad times after updating to 13.10

  - by Richard

  A bug, I think, though I can't even seem to find any information when searching for it. The mouse pointer hides itself, but it is still possible to use it. Whenever I start watching a video in VLC, or start playing KSP through Steam my mouse pointer disappears. It is not returned upon exiting the application. I have not tried with other games in Steam. The mouse pointer do not disappear when watching videos online through YouTube, though it properly hides itself after a few seconds. The bug came about after I updated to 13.10, it was not present with the same setup in 13.04. I have tried removing ~/.compiz and restarting the kernel module psmouse. Going to tty1 and back to the desktop reveals the pointer, though this fix is bothering me. How do I fix this problem?

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• Ubuntu 14.04 + nvidia-331-updates makes a blank desktop screen

  - by Achint

  I upgraded my installation from 13.10 to 14.04. The problem is that whenever I install the Nvidia drivers from the GUI, upon reboot or trying to login again it only shows the wallpaper of my desktop and nothing else. The mouse does move around, but nothing works. I am unable to open a terminal or do anything else. If I go into the tty console and purge the drivers, then things seem to work again. I have an Optimus setup, with an onboard Intel and discrete Nvidia GTX770M card. It's a 64-bit architecture. I really need to work with CUDA, and was hopeful after hearing that nvidia-prime was released, but this is a real downer. Any help on this?

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• Ubuntu 12.04 PXELINUX does not boot RHEL Kernel and Initrd

  - by utpal

  I have successfully setup PXE server on Ubuntu 12.04 with DNSMASQ for DHCP Proxy Service, TFTPD-HPA for TFTP service, NFS-KERNEL-SERVER, APACHE2 and SYSLINUX for pxelinux.0 bootloaded needed for pxe boot using the following POST: http://ubuntuforums.org/showthread.php?t=1606910 I was successfully able to pxe boot a client to a Ubuntu 12.04 LIVE CD. Next, I want to PXE boot a client to a RHEL 6.5 x64 Kernel and initrd image. I dont want to install, just boot a client so that it mounts initrd and I can get a minimal filesystem on the client. How can I do that? Please Help!!

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• MammothVPS launches Backups, DNS Management and more!!!

  - by stefan.sedich

  Yesterday we launched a bunch of new features over at MammothVPS, - All VPS' now have an on-site, off-server backup facility available to them. By default all customers will have 1 free weekly backup made available to them, and should you wish to you can purchase more slots which are available in daily, weekly and monthly schedules. - DNS hosting has been made available and will be free for all customers. You can find the new interface in your mPanel. - A cleanup of the menu system has been done to make it easier to navigate around both the site and mPanel. - You will find new sections on site, we now have more information about our services and have included things like a Knowledge Base, which will provide information on howto setup various applications on your VPS. - Added the ability to change the kernel your VPS is running on. So head on over to MammothVPS and check it out.

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• Setting umask globally

  - by DevSolar

  I am using a private user group setup, i.e. a user foo's home directory is owned by foo:foo, not foo:users. For this to work, I need to set the umask to 002 globally. After a quick grep -RIi umask /etc/*, it seemed for a moment that modifying the UMASK entry in /etc/login.defs should do the trick. It does, too -- but only for console logins. If I log in to my desktop, and open a terminal there, I still get to see the default umask 022. Same goes for files created from apps started through the menu. Apparently, the display manager (or whatever X11 component responsible) does source some different setting than a console login does, and damned if I could tell which one it is. (I tried changing the setting in /etc/init.d/rc, and no, it did not help.) How / where do I set umask globally, so that the X11 desktop environment gets the memo as well?

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• How to render Minecraft on the GPU?

  - by l0b0

  Hardware: Intel i7 AMD Radeon HD 6970 SSD with plenty of space 6 GB RAM Software OpenJDK 6, 7, and Oracle Java 7 (reproducible with all three) AMD Catalyst 12.8 and open source driver (reproducible with both) Ubuntu 12.04 x86_64 and older Minecraft 1.3.2 vanilla and older On this setup I am getting rubbish frame rates after a short while of playing, dropping from about 45-55 to 15 in a couple of minutes. CPU use is 40-45 even when rendering the opening screen at 1920x1280, and gameRenderer is using about 90% CPU when playing. Rather than trying to eke out a few more FPS out of an obviously broken rendering pipeline, I really hope to find a solution to make the GPU render Minecraft.

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