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  • Why not Green Threads?

    - by redjamjar
    Whilst I know questions on this have been covered already (e.g. http://stackoverflow.com/questions/5713142/green-threads-vs-non-green-threads), I don't feel like I've got a satisfactory answer. The question is: why don't JVM's support green threads anymore? It says this on the code-style Java FAQ: A green thread refers to a mode of operation for the Java Virtual Machine (JVM) in which all code is executed in a single operating system thread. And this over on java.sun.com: The downside is that using green threads means system threads on Linux are not taken advantage of and so the Java virtual machine is not scalable when additional CPUs are added. It seems to me that the JVM could have a pool of system processes equal to the number of cores, and then run green threads on top of that. This could offer some big advantages when you have a very number large of threads which block often (mostly because current JVM's cap the number of threads). Thoughts?

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  • Silly Developers, VirtualBox Is For Sysadmins!

    - by rickramsey
    That's one of my favorite bumper stickers. (Well, along with the sticker placed upside down on Jeep windows that says "If you can read this, roll me over.") I don't object to the "silly boys" sticker because, in my humble opinion, girls look much cuter in Jeeps than guys do. But as Ginny Henningsen points out, a similar sentiment can be applied to Oracle VM VirtualBox. While writing her other sysadmin-related articles for OTN, Ginny horsed around with VirtualBox so much that she fell in love with it. Not as a developer, but as a sysadmin. Read why she thinks it's such a great sysadmin tool: My New Favorite Sysadmin Tool: Oracle VM VirtualBox Here are some of Ginny's other articles: How I Simplified Oracle Database Installation on Oracle Linux Best Way to Update Software With IPS Best Way to Automate ZFS Snapshots and Track Software Updates Best Way to Update Software in Zones - Rick Ramsey Website Newsletter Facebook Twitter

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  • How do I change which audio jacks are used for input and output?

    - by yamaha1996
    I'm using a Realtek HD audio card built-in my motherboard. The Windows driver comes with a control panel that allows me to select which back panel jacks are used for what. So for example I can make both the blue jack and green jack for output and only the red one for mic-in. (Whereas by default, the blue jack is for line in, which I never need.) How can I do the same under Linux? If possible, please don't suggest something that involves PulseAudio or JACK; I'd like to do it the plain way, e.g. by editing ALSA configuration files, if possible. The way I understand it, my problem should have nothing to do with software servers redirecting streams, just instructing the driver to treat this jack as so and so because it's hardware supported. Thank you very much!

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  • HFS+ hard drive being mounted as read only

    - by DNA
    This is a recurring problem and occurs a few times a week. I have an external hard drive which is hfs+. Every couple of weeks, for no obviuous reason, when I mount it by pluggin it in to my Ubuntu 11.10, it is read only and I can't copy any files into it. I gksudo nautlius and change the ownership and it magically works in some time. But returns to the read only state soon in a few hours-days without any rhyme or reason. Right now my fstab doesn't have any entry for my hard drive. What gives? What in the world is going on with Linux/HFS+? This is frustrating. I can't reformat my hard drive because I have almost a terrabyte of data in it and no receptacle to hold it while I reformat it.

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  • Puppet and Vim fighting over Ruby version

    - by devians
    I have installed puppet from the .dmg from puppetlabs. If I remove ruby 1.9.3, puppet works, but other things like my vim install (dependant plugins) do not. According to http://docs.puppetlabs.com/guides/platforms.html#ruby-versions 1.9.3 is supported. So whats going wrong with puppet? % uname -a Darwin Kusanagi.local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64 % which ruby /usr/local/bin/ruby % ruby --version ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin11.4.2] % /usr/bin/ruby --version ruby 1.8.7 (2012-02-08 patchlevel 358) [universal-darwin11.0] % brew info ruby 1 ? ruby: stable 1.9.3-p327, HEAD http://www.ruby-lang.org/en/ Depends on: pkg-config, readline, gdbm, libyaml /usr/local/Cellar/ruby/1.9.3-p327 (796 files, 17M) * https://github.com/mxcl/homebrew/commits/master/Library/Formula/ruby.rb ==> Options --with-tcltk Install with Tcl/Tk support --with-suffix Suffix commands with "19" --universal Build a universal binary --with-doc Install documentation ==> Caveats NOTE: By default, gem installed binaries will be placed into: /usr/local/Cellar/ruby/1.9.3-p327/bin You may want to add this to your PATH. % puppet /usr/local/Cellar/ruby/1.9.3-p327/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- puppet/util/command_line (LoadError) from /usr/local/Cellar/ruby/1.9.3-p327/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from /usr/bin/puppet:3:in `<main>'

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  • Create Your Own Geeky LED Holiday Lights with Old Bottles

    - by YatriTrivedi
    Who needs to go buy store-bought lights? Here’s a great geek project for the holidays that’s fairly easy to put together with things most geeks already have. My friend, Chris “Groff” Groff, had the great idea to work up some holiday lights using stuff he had lying around, and a few hours later things turned out quite geeky indeed. Materials Latest Features How-To Geek ETC The How-To Geek Holiday Gift Guide (Geeky Stuff We Like) LCD? LED? Plasma? The How-To Geek Guide to HDTV Technology The How-To Geek Guide to Learning Photoshop, Part 8: Filters Improve Digital Photography by Calibrating Your Monitor Our Favorite Tech: What We’re Thankful For at How-To Geek The How-To Geek Guide to Learning Photoshop, Part 7: Design and Typography Fun and Colorful Firefox Theme for Windows 7 Happy Snow Bears Theme for Chrome and Iron [Holiday] Download Full Command and Conquer: Tiberian Sun Game for Free Scorched Cometary Planet Wallpaper Quick Fix: Add the RSS Button Back to the Firefox Awesome Bar Dropbox Desktop Client 1.0.0 RC for Windows, Linux, and Mac Released

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  • Display clock frequency per core using Conky

    - by cfbaptista
    I am using Conky to display a lot of information of my system. I managed to display the load percentage per core. But I do not know how to display the clock frequency of each core. What I have now is: ${font sans-serif:bold:size=8}PROCESSORS ${hr 2}${font} CPU1: ${cpu cpu1}% $alignr ${freq} MHz $alignr ${cpubar cpu1 8,60} CPU2: ${cpu cpu2}% $alignr ${freq} MHz $alignr ${cpubar cpu2 8,60} CPU3: ${cpu cpu3}% $alignr ${freq} MHz $alignr ${cpubar cpu3 8,60} CPU4: ${cpu cpu4}% $alignr ${freq} MHz $alignr ${cpubar cpu4 8,60} CPU5: ${cpu cpu5}% $alignr ${freq} MHz $alignr ${cpubar cpu5 8,60} CPU6: ${cpu cpu6}% $alignr ${freq} MHz $alignr ${cpubar cpu6 8,60} CPU7: ${cpu cpu7}% $alignr ${freq} MHz $alignr ${cpubar cpu7 8,60} CPU8: ${cpu cpu8}% $alignr ${freq} MHz $alignr ${cpubar cpu8 8,60} But this only gives me the global clock frequency and not the individual clock frequency per core. Does someone know how to get the individual clock frequency per core? System information Linux Mint 13 KDE, 64 bit (based on Ubuntu 12.04) Intel i7-2670QM (quad core with multithreading)

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  • Can't find Localhost files

    - by GMF
    Hope you can help. This is my first time trying Ubuntu/Linux. I am logged in as root I have downloaded and installed LAMP and PHPMYADMIN. I get the test page under localhost say that It works and is installed Correctly. I have also put my files in the /var/www. they are PHP files When I put the address localhost/(page name.php) I get an error saying Not Found The requested URL /index.php was not found on this server. Apache/2.2.22 (Ubuntu) Server at localhost Port 80 I Have put the files in the wrong folder?? If I look in the "/etc/ap[ache2/sites-available/default", It tells my my DocumentRoot is /var/www Would love somehelp on this please Many thanks GF

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  • Ask the Readers: What’s the First Thing You Do After Installing a New OS?

    - by Jason Fitzpatrick
    You’ve just booted up your new OS for the first time after a fresh install. What’s the first thing you do? Install specific apps? Tweak settings? Bask in the new-computer-smell of an uncluttered OS? Once a week we put a question before the How-To Geek readership to give you all a chance to share your knowledge and tips with your fellow readers. This week we want to hear about your tips and tricks for whipping a new OS installation into shape. Whether you’ve just installed Windows, Mac OS X, or Linux, we’re curious what kind of computer-warming rituals you visit upon your new OS. Sound off in the comments below and then check back in on Friday for the What Your Said roundup.  How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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  • "isolinux.bin is missing or corrupt", when attempting to boot using disk in USB CD DRIVE

    - by Rodrigo Salazar
    I have an external CD drive which connects to USB. I burned 11.10 Ubuntu image to CD-R. The disk correctly shows me install page when I autoload disk within Windows 7. When I restart to attempt to boot from disk to install Ubuntu I get the following error for a split second before I continues to boot to Windows. "isolinux.bin is missing or corrupt". Clearly my computer knows that this is a Linux disk in the usb cd-drive...What went wrong? edit: I reburned another disk, same error

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  • Terminal Errors/Package Erros

    - by Bryan
    After running some updates a week ago or so, I've noticed that after any installations via the Ubuntu Software Center or any installed in the GUI have given an error message stating that there was a package error. Also any installations done through the terminal have given the E: Sub-process /usr/bin/dpkg returned an error code (1) message at the end of each install. Oddly, the software is still installed and seems to function properly. Is there any way to get rid of this? I've tried to run apt-get autoclean as recommended on another site, but this doesn't seem to work. I'm fairly new to Linux/Ubuntu, just FYI.

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  • Using Hadooop (HDInsight) with Microsoft - Two (OK, Three) Options

    - by BuckWoody
    Microsoft has many tools for “Big Data”. In fact, you need many tools – there’s no product called “Big Data Solution” in a shrink-wrapped box – if you find one, you probably shouldn’t buy it. It’s tempting to want a single tool that handles everything in a problem domain, but with large, complex data, that isn’t a reality. You’ll mix and match several systems, open and closed source, to solve a given problem. But there are tools that help with handling data at large, complex scales. Normally the best way to do this is to break up the data into parts, and then put the calculation engines for that chunk of data right on the node where the data is stored. These systems are in a family called “Distributed File and Compute”. Microsoft has a couple of these, including the High Performance Computing edition of Windows Server. Recently we partnered with Hortonworks to bring the Apache Foundation’s release of Hadoop to Windows. And as it turns out, there are actually two (technically three) ways you can use it. (There’s a more detailed set of information here: http://www.microsoft.com/sqlserver/en/us/solutions-technologies/business-intelligence/big-data.aspx, I’ll cover the options at a general level below)  First Option: Windows Azure HDInsight Service  Your first option is that you can simply log on to a Hadoop control node and begin to run Pig or Hive statements against data that you have stored in Windows Azure. There’s nothing to set up (although you can configure things where needed), and you can send the commands, get the output of the job(s), and stop using the service when you are done – and repeat the process later if you wish. (There are also connectors to run jobs from Microsoft Excel, but that’s another post)   This option is useful when you have a periodic burst of work for a Hadoop workload, or the data collection has been happening into Windows Azure storage anyway. That might be from a web application, the logs from a web application, telemetrics (remote sensor input), and other modes of constant collection.   You can read more about this option here:  http://blogs.msdn.com/b/windowsazure/archive/2012/10/24/getting-started-with-windows-azure-hdinsight-service.aspx Second Option: Microsoft HDInsight Server Your second option is to use the Hadoop Distribution for on-premises Windows called Microsoft HDInsight Server. You set up the Name Node(s), Job Tracker(s), and Data Node(s), among other components, and you have control over the entire ecostructure.   This option is useful if you want to  have complete control over the system, leave it running all the time, or you have a huge quantity of data that you have to bulk-load constantly – something that isn’t going to be practical with a network transfer or disk-mailing scheme. You can read more about this option here: http://www.microsoft.com/sqlserver/en/us/solutions-technologies/business-intelligence/big-data.aspx Third Option (unsupported): Installation on Windows Azure Virtual Machines  Although unsupported, you could simply use a Windows Azure Virtual Machine (we support both Windows and Linux servers) and install Hadoop yourself – it’s open-source, so there’s nothing preventing you from doing that.   Aside from being unsupported, there are other issues you’ll run into with this approach – primarily involving performance and the amount of configuration you’ll need to do to access the data nodes properly. But for a single-node installation (where all components run on one system) such as learning, demos, training and the like, this isn’t a bad option. Did I mention that’s unsupported? :) You can learn more about Windows Azure Virtual Machines here: http://www.windowsazure.com/en-us/home/scenarios/virtual-machines/ And more about Hadoop and the installation/configuration (on Linux) here: http://en.wikipedia.org/wiki/Apache_Hadoop And more about the HDInsight installation here: http://www.microsoft.com/web/gallery/install.aspx?appid=HDINSIGHT-PREVIEW Choosing the right option Since you have two or three routes you can go, the best thing to do is evaluate the need you have, and place the workload where it makes the most sense.  My suggestion is to install the HDInsight Server locally on a test system, and play around with it. Read up on the best ways to use Hadoop for a given workload, understand the parts, write a little Pig and Hive, and get your feet wet. Then sign up for a test account on HDInsight Service, and see how that leverages what you know. If you're a true tinkerer, go ahead and try the VM route as well. Oh - there’s another great reference on the Windows Azure HDInsight that just came out, here: http://blogs.msdn.com/b/brunoterkaly/archive/2012/11/16/hadoop-on-azure-introduction.aspx  

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  • How to set wifi driver settings to prefer 5 GHz channel above 2.4 GHz

    - by Wouter
    Currently I'm in a new building of my university. In this building my wifi often breaks down and then restores connection again. This is really irritating since it happens a lot. Now as a coincidence there were some tech guys running around here and where asking everyone if the wifi was doing fine. I told them that my wifi tears down all the time and then reconnects. They figured out that my wifi is switching all the time between the 2.4 GHz channel and 5 GHz channel. They asked me if I could acces the driver settings of my wireless card. Unfortunately I don't know how to do this is in either Linux or Windows. And unfortunately again they only knew the windows solution xD. So I hope somebody can tell me how I tell my wifi that it should stay on the 5 GHz network and not disconnect and switch to the 2.4 GHz channel?

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  • #1045 Cannot log in to the MySQL server

    - by user1198291
    I am totally new in linux/ubuntu I am trying to setup lamp on my OS, however I've installed apache , php , mysql by following commands: sudo apt-get install apache2 sudo apt-get install php5 sudo apt-get install libapache2-mod-php5 sudo apt-get install mysql-server libapache2-mod-auth-mysql php5-mysql sudo apt-get install phpmyadmin everything works fine except that i totally cannot log into MySQL(which leads to phpmyadmin failure login) getting the errors : #1045 Cannot log in to the MySQL server Access denied for user 'root'@'localhost' (using password: YES) I googled the problem and also I have tried to reinstall all installed components, but the same result came up! in windows i usually modified the content of mysql configure file but in ubuntu nothing is as same as windows!:) can anybody help me on this, really need to setup lampp :-S thanks in advanced

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  • Display problem with fresh install of 12.04

    - by Dan
    Just intalled Ubuntu 12.04 from CD and install went with no problems. After rebooting, I get the initial purple screen and then a black screen with mouse pointer and a few stray pixels at the bottom left of screen. Occasionally during the boot process, the purple screen comes back momentarily but then back to the black screen with the mouse pointer. When I finally give up and press the power button, the purple screen returns with the Shut Down box visible as it is shutting down. Any ideas? I have tried adding nomodeset after quiet splash, but no change. Possibly not doing it correctly, since I am somewhat of a newbie to linux. Thanks! Dan

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  • Why Ubuntu Softwares are not packaged in a single file?

    - by Anwar Shah
    We see Most of the Windows Softwares are packaged in a Single executable file. When I double-click Setup file, it sets up all the files, binaries and libraries with it. I understand the dependency of Ubuntu or more generally linux packages. But I wonder, Why these exists. Isn't it possible to build a single file with all dependencies. What is the problems with this method? Please try to give the reason in details.

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  • Rendering CV template with XeLaTex

    - by jacob
    Installed kubuntu on thursday Installed LaTeX on my kubuntu machine, using full Compiled an old document and it worked fine Downloaded a CV template from http://www.latextemplates.com/template/two-column-one-page-cv Compiled it, got error Fatal fontspec error: "cannot-use-pdftex" The fontspec package requires either XeTeX or LuaTeX to function. You must change your typesetting engine to, e.g., "xelatex" or "lualatex" instead of plain "latex" or "pdflatex". See the fontspec documentation for further information. For immediate help type H . Installed XeLaTex using this guide http://ledgersmb.org/faq/xelatex i.e. 7 Installed texlive-xetex that includes xelatex apt-get install texlive-xetex apt-get install liblatex-{driver,encode,table}-perl apt-get install libtemplate-plugin-latex-per 8) Compiled CV template again, did not work. Related: No Xelatex in texlive 2012 Excuse me if my question is not clear enough, I'm new to linux.

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  • su: Authentication failure

    - by user166999
    I have downloaded the Eset Nod32 Antivirus from its website, and I got a eset_nod32av_64bit_en.linux file. I have right-clicked on it, Properties - Permissions, and checked the Allow executing file as program option. Then I was able to run the program. The Installer starts and it asks for my root password. I enter it correctly, but then I get the following error message: "su: Authentication failure". What can I do with this to install the Nod32? Thanks!

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  • Convert DVD to MKV (et al) without transcoding/recompression

    - by Oli
    Like a lot of people, I have a lot of DVDs. But we also have a stupid amount of disk space and a media centre (Boxee) so the DVDs are getting less and less use. It would be nice to convert our DVDs into something more relevant to our needs. I've dabbled with DVD ripping before but whereas I'd usually transcode down to a smaller picture size with a better video compression algorithm, this takes a silly amount of time. I don't have a couple of hours available for each disk. (Sidebar: is there dedicated, Linux-friendly hardware to improve h264 encoding performance?) So I was wondering if there's anything that take the DVD filesystem, De-CSS it, and then stitch together any the VOBs that make up the main part of the film and package that up in a wrapping format like MKV. A bonus would be if it could grab the subtitles and stick them in too but that's not a requirement as Boxee can grab the subtitles online if it needs to.

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  • Six Rubens’ Tubes Combined Into a Fire-Based Music Visualizer [Video]

    - by Jason Fitzpatrick
    The last Rubens’ Tube setup we shared with you was but a simple single tube. This impressive setup is six independent tubes that register distinct frequencies of sound in a musical composition as standing flames. Check out the video to see it in action. Curious about the Rubens’ Tubes? Read more about the phenomenon here. [via Design Boom] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • The Best of CES (Consumer Electronics Show) in 2011

    - by Justin Garrison
    This year, How-To Geek’s own Justin was on-site at the Consumer Electronics Show in Las Vegas, where every gadget manufacturer shows off their latest creations, and he was able to sit down and get hands-on with most of them. Here’s the best of the bunch. Make sure to also check out our list of the Worst of CES 2011, where we covered the gadgets that just didn’t make the cut Latest Features How-To Geek ETC HTG Projects: How to Create Your Own Custom Papercraft Toy How to Combine Rescue Disks to Create the Ultimate Windows Repair Disk What is Camera Raw, and Why Would a Professional Prefer it to JPG? The How-To Geek Guide to Audio Editing: The Basics How To Boot 10 Different Live CDs From 1 USB Flash Drive The 20 Best How-To Geek Linux Articles of 2010 Arctic Theme for Windows 7 Gives Your Desktop an Icy Touch Install LibreOffice via PPA and Receive Auto-Updates in Ubuntu Creative Portraits Peek Inside the Guts of Modern Electronics Scenic Winter Lane Wallpaper to Create a Relaxing Mood Access Your Web Apps Directly Using the Context Menu in Chrome The Deep – Awesome Use of Metal Objects as Deep Sea Creatures [Video]

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  • Square Reader Modified to Record Off Old Reel-to-Reel Tape [Video]

    - by Jason Fitzpatrick
    The Square Reader is a tiny magnetic credit card reader that has taken the mobile payment industry by storm. This clever hack dumps the credit card reading in favor of snagging the audio from old music reels. Evan Long was curious about whether the through-the-headphones interface of the Square Reader could be used to read audio data off old magnetic recordings. With a very small modification (he had to bend a metal tab inside the reader to allow the audio tape to slide through more easily) he was able to listen to and record audio off old reels. Watch the video above to see it in action or hit up the link below to read more about his project. iPod Meets Reel [via Make] HTG Explains: What Is Windows RT and What Does It Mean To Me? HTG Explains: How Windows 8′s Secure Boot Feature Works & What It Means for Linux Hack Your Kindle for Easy Font Customization

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  • Chainload boot of Ubuntu installed on 32GB SD card from legacy Grub boot on USB

    - by Gary Darsey
    I have Ubuntu installed on a 32 GB SD card (in the Storage Expansion slot on an Acer Aspire One) with Grub2 installed in the same partition. I boot into legacy Grub on a USB drive and would like to boot by chainloading Grub2 from Grub (kernel/initrd or symlink booting would also be fine), but I haven't figured out how to do this from legacy Grub CLI. Output from blkid for this partition is /dev/mmcblk0p1: LABEL="Ubuntu" UUID="7ceb9fa7-238c-4c5d-bb8e-2c655652ddec" TYPE='ext4" / fdisk -lu information Boot indicator ID 83. Related entries in grub.cfg: search --no-floppy --fs-uuid --set-root 7ceb9fa7-238c-4c5d-bb8e-2c655652ddec linux /boot/vmlinuz-3.5.0-17-generic root=UUID=7ceb9fa7-238c-4c5d-bb8e-2c655652ddec... initrd /boot/initrd.img-3.5.0-17-generic I can't seem to replicate this in legacy Grub. Is there any way get Grub2 to chainload? How do I set root with UUID in legacy Grub? I prefer to boot from USB. Would Grub2 on USB (copying the grub.cfg generated during installation) be an option?

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  • NX/SSH remote access with Remmina

    - by Niklas
    After many days and a lot of frustration, I managed to get freenx to work on my home server. I can connect to it with nomachine's linux client, but I want to use Remmina for this purpose. The problem is that I don't exactly know how to connect to a NX-server with the program. In the connection dialog, I've chosen SSH as the protocol, and I've correctly added the IP and port. Under "SSH Authentication" I've added my user name on the server, and I choose "identity file" and selected the ssh-key I generated (which works with nxclient). (When am I supposed to provide my password for the user on the server?) When I try to connect I get the message: SSH public key authentication failed: Public key file doesn't exist Why do I get this message? How shall I proceed correctly to get the authentication working? Thank you for your time!

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  • Java doesn't show up in firefox plugins

    - by user857990
    I've just installed the newest java, because firefox blocks the old version. I used the tutorial from http://www.backtrack-linux.org/wiki/index.php/Java_Install Because I had some trouble once, I knew that there are multiple library folders, so I linked into all mozilla plugin folders that there are. /root/.mozilla/plugins /usr/lib/firefox/plugins/ /usr/lib/firefox-addons /usr/lib/mozilla/plugins /usr/lib64/mozilla/plugins java -version returns java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode) But when I go to firefox plugins, it's not listed. What do I need to do, so that firefox recognizes java?

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