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Articles indexed Thursday September 20 2012

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• Is php|architect any good?

  - by Andrew Heath

  Kind of a hard topic to search for, as architect turns up a lot about software architects instead. After 8 months of PHP self-study, I finally stumbled across the php|architect site. The length of time it took me to find it makes me suspicious of its quality. 3 related questions: do professional PHP coders read/care about php|architect? is it a good source for PHP beginners? assuming yes to either of the above, how far back in the archives to articles remain relevant? (ex: does stuff written about PHP4 still matter?)

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• Recently purchase a Linode server. Wondering how to keep track of modifications

  - by eveo

  I purchased a server for the sole purpose of familiarizing myself with the CLI so I don't get royally screwed when I enter a real development environment. However, I have some questions. I've managed to SSH into my server, all is fine and dandy, installed LAMP too which went flawlessly. Now I'm wondering, the more changes I do, the more cluttered my server will become. Can I revert changes? I don't want to keep customizing things and installing things and just having a cluttered server overall. Where can I track changes to my system?

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• dun goofed the files in /usr/lib/x86_64-linux-gnu/

  - by tipu

  there was some weird package issue with (in my limited understanding) 32/64 bit libraries, so i went around making symlinks to the file my lamp installation expected to the ones that actually existed. i did this for a # of files in here: /usr/lib/x86_64-linux-gnu/ however php still ended up not working (separate issue) and now i believe i have a screwed up lib directory. is there a way to revert those library files?

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• Unable to complete ubuntu installation

  - by Hugh Levinson

  I am not a computer expert and have no programming experience. I have downloaded Ubuntu 12.04 from the website using the Windows installer onto an admittedly old Toshiba Satellite Pro laptop. The download seemed to be fine. When I try to startup the laptop and select Ubuntu I get a long series of messages starting: "error: couldn't read file [0.7392640 Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block (0,0)" I have seen other entries on this messageboard with similar questions but to be honest, I can't follow the answers, which presume more knowledge than I have. I would be extremely grateful if anyone could suggest a solution.

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• Ubuntu 12.04 LTS: Error message "Failed to execute child process"

  - by Ron

  I am an Ubuntu-newbie and just started working with Ubuntu (version 12.04 LTS) a couple of days ago. I wanted to add a launcher icon to desktop for launching an application I previously installed. Up to now I can only launch it by typing setsid matlab -desktop into my terminal. Now there is the following problem with the execution via the desktop icon: Whenever I click the desktop icon, I get the following error message: "Failed to execute child process" I would like to add a screenshot, but unfortunately as a new user, I am not allowed to... In the main menu from where I added the icon via drag'n'drop to desktop there is also a permission to execute the .desktop file. I also tried to look for advice on the error message "Failed to execute child process..." but could not find anything useful. Now does anybody have an idea what I am missing? Sorry if this is a stupid question ;) ...but as I just said: I just started with Ubuntu... Thanks to everybody in advance for their help! :) And let me know if you should need any more information... Regards, Ron

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• How to Roll Back to Original Plymouth Splash

  - by fleamour

  The title says it all. It's a bit of an eyesore with propriety NVIDIA drivers, so I tried here. I'm pretty sure I reversed all settings, when it did not work for me. But now: sudo update-alternatives --config default.plymouth Returns error: update-alternatives: error: cannot stat file '/lib/plymouth/themes/default.plymouth': Too many levels of symbolic links I just wanna revert back to the vanilla 12.04 LTS Plymouth splash. Thanks. Also: sudo gedit /lib/plymouth/themes/default.plymouth Returns: "The number of followed links is limited and the actual file could not be found within this limit."

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• My wireless connection isn't working well

  - by Maikel Braas

  So this is my problem, I intalled ubuntu 12.04 with the wubi.exe and everything works fine, but my internet connection. When I try to install a program or use firefox, it goes with 24kb/s with a little luck for 1-2 seconds and then my internet terminates and it starts up again after 3-5 mins. Then it goes with an other 24kb/s and this will repeat. The thing is my connection works perfectly with windows. The laptop its running on is a Acer ASPIRE V3-771G. I tryed using a different network adaptor but that didn't help either. Please, some one help me with this. friendly regards, Maikel

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• How to mount a drive for other user than root?

  - by Ondra Žižka

  I've attached a SSD disk though USB. Then: sudo su - mkdir /mnt/hx chown ondra /mnt/hx mount /dev/sdb1 /mnt/hx # It's FAT32 now, but was the same with EXT4 The last command changes dir owner to root. Whenever I create a file in the root dir, I need to be root and root is the owner. Can I set different user as owner of the mounted dir? Or, simply said, ensure that user XY can freely read/write on the drive.

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• Unity Dash to search only in Documents

  - by bioShark

  I have a document (LibreOffice Calc Spreadsheet) which is in my ~/Documents folder. However, I have the same file (older version of it) on a mounted drive. In the past few weeks I have opened the file from both my ~/Documents folder and from the mounted drive. However, the latest version is the one from ~/Documents. When I open the Dash and look in the documents lens, of course I will find my file twice there. One from the mounted disk and one from ~/Documents. But I don't know which one is which. So, my question is: How can I limit the document lens to look for documents only from my /home. Or to exclude mounted disks from the search. Thanks. I use Ubuntu 12.04.

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• what packages should I install in ubuntu 12.04 to fulfill opengl requirements for using nouveau driver?

  - by karolszk

  I try to switch from nvidia to nouveau driver via script: !/bin/bash stop gdm rmmod nvidia sed -i "s/nouveau/nvidia/" /etc/modprobe.d/blacklist-nvidia-nouveau.conf update-alternatives --set gl_conf /usr/lib/mesa/ld.so.conf ldconfig modprobe nouveau cp /etc/X11/xorg.conf{.nouveau,} start gdm and driver is loaded and X started but compiz it doesn't. In .xsession-errors I see: Compiz (opengl) - Fatal: Root visual is not a GL visual compiz (opengl) - Error: initScreen failed compiz (core) - Error: Couldn't activate plugin 'opengl' Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual Compiz (opengl) - Fatal: Root visual is not a GL visual gnome-session[19075]: WARNING: App 'compiz.desktop' respawning too quickly gnome-session[19075]: WARNING: Application 'compiz.desktop' killed by signal gnome-session[19075]: WARNING: App 'compiz.desktop' respawning too quickly what I'm doing wrong??

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• Unexpected deletion of directory

  - by Anubhav Chaturvedi

  I find that somehow the Downloads directory in /home/user/ is deleted. on using $locate Downloads, it shows the existence of directory without any existence of files within. now when i manually create directory named Downloads, $ locate Downloads shows the directory as well as the files the original folder had. also there is no hidden Downloads folder nor can i access the folder or its files this behavior is quite unexpected .... please help.

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• How do I find add-ons for packages when using the command line?

  - by user74660

  My question is a little bit different from others already asked, I guess. I've already searched for answers, but I didn't find anything related. For example, I've always installed K3B via Terminal with the following command "sudo apt-get install k3b". It always worked, of course. One day, I decided to install it via Ubuntu Sofware Center and, to my surprise, there were a few Add-ons I didn't know about. I checked some of them to be installed as well because I found them useful. Now, here's my question: When we try to install a software via Terminal and this software has add-ons, how do we know that? And how do we install the add-ons via Terminal? I suppose we have to know the names of the add-ons first, and then install them one by one, once the main software has already been installed. But how do we get to know those names via Terminal? Using the Software Center is cool because it shows the add-ons, a brief description for each one and their names in brackets, right? How about that via Terminal? I had never paid attention to this until I used the Software Center. By the way, K3B was just an example, of course.

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• Xorg becomes unkillable at 3AM

  - by chew socks

  Most nights, some time in the hour of 3AM my xorg process will increase to 100% cpu and gpu load will also increase to 100%. The process also becomes unkillable. I cannot sudo kill -9 it or get back control with sudo service lightdm restart. I also cannot switch to to a tty screen with ctrl + alt + f1. To reboot I have to log in with ssh, but this is not perfect because if I reboot while it is doing this my ZFS pool will fail to mount when it comes back up ( that is where my /home is ). Does anyone have any ideas as to why I can't stop and restart xorg, or even better, know why this is happening? Thanks NOTE: For anyone who comes looking for the same problem. I disabled catalyst AI and made it through the night. I've been up for 1 day 3 hours now. My record for this month is 2 days and 19 hours without a problem. My all time record is 6 days without a crash. I'll post here if it crashes again or I'm able to set a new record.

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• How do I set up live audio streams to a DLNA compliant device?

  - by Takkat

  Is there a way to stream the live output of the soundcard from our 12.04.1 LTS amd64 desktop to a DLNA-compliant external device in our network? Selecting media content in shared directories using Rygel, miniDLNA, and uShare is always fine - but so far we completely failed to get a live audio stream to a client via DLNA. Pulseaudio claims to have a DLNA/UPnP media server that together with Rygel is supposed to do just this. But we were unable to get it running. We followed the steps outlined in live.gnome.org, this answer here, and also in another similar guide. As soon as we select the local audio device, or our GST-Launch stream in the DLNA client Rygel displays the following message and the client states it reached the end of the playlist: (rygel:7380): Rygel-WARNING **: rygel-http-request.vala:97: Invalid seek request This is how we configured GST-Launch in rygel.conf: [GstLaunch] enabled=true launch-items=mypulseaudiosink mypulseaudiosink-title=Audio on @HOSTNAME@ mypulseaudiosink-mime=audio/x-wav mypulseaudiosink-launch=pulsesrc device=<device> ! wavpackenc For <device> we tried with the default sink name, this name appended with .monitor, and in addition with upnp-sink and upnp.monitor that was created when we selected DLNA media server from paprefs. We also tried to encode using lamemp3enc with no luck. These are our pulseaudio modules: http://paste.ubuntu.com/1202913/ These are our sinks: http://paste.ubuntu.com/1202916/ Did we miss any other additional configuration needed to get this running? Are there any other alternatives for sending the audio of our soundcard as live stream to a DLNA client?

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• Does google contribute ranking from cdn.example.com to example.com?

  - by DesignerGuy

  Background From my understanding, http://mywebsite.com/image.jpg, can help the ranking of http://mywebsite.com in a search engine, such as Google (obviously the search engine of primary concern). So, SEO-wise, moving an image to http://whatever-cdn.com/my-account/image.jpg is bad. A popular solution is to use a CNAME record, such as http://cdn.mywebsite.com, so that image.jpg can be accessed at http://cdn.mywebsite.com/image.jpg. The question Does http://cdn.mywebsite.com/image.jpg rank as effectively as http://mywebsite.com/image.jpg ? Does it help boost the main http://mywebsite.com ? Or, does it rank independently because it is a subdomain? Is there another option (a way to use a CDN without sacrificing ranking)?

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• Where to get ads for my website ?

  - by Divyanshu Negi

  I am the developer of the website named viewloud Now as my website is getting around 100 visitors per day so i was thinking that i should put some ads on my website but it is really very hard to find the best advertising plan which can benefit me the most. Google adsence . Is it a good choice ? Will google adsence allow me to open a account there with such little traffic on my website. ? Please help from last two months i have done a very hard work to bring such tarffic :p i know it is very less but i am still working on it .. so please help me guys. Thank you Divyanshu

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• Redirecting 2 or more domains to same hosting server

  - by mtk

  I have domains A.com, A.co.in and A.in Purchased from site X. I have a hosting space/account purchased from site Y, which has provided me with 2 DNS entries that is to be replaced in the account at the site from where I purchase the domains. I have successfully changed the DNS entries of A.com to these 2 DNS entries and I am able to see my index.html page when I hit A.com. Problem On similar lines, I have changed the DNS entries to the same entries for A.co.in and A.in, but on hitting those sites in browser gives me no response and browser specific page of 'Site not found' is been seen. Please let me know, how to set this, so that when I hit any of the domain, the web-site is rendered from the hosting server? What am I doing wrong here? Note It has been more than 3 days after changing the DNS entries, so I don't think so this is a problem of DNS propagation, which I heard from some people. Please provide some detail explanation, as I am very very new to this. This is my first hosting ;) -Thanks

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• Email links open in a new window [closed]

  - by Dan

  I'm asking this as an opinion question. How does everyone treat email links opening in a new window if their default email client is web based? This way? <a href="mailto:[email protected]">email me</a>. It will open fine for app based email clients but open in the same window for web based clients. This way? <a href="mailto:[email protected]" target="_blank">email me</a>. It will open in a new tab for web based email clients but open a blank tab. I cant really seem to find the best of both worlds. What does everyone else do?

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• Retroactively applying a Piwik goal to visitors

  - by Andrew Aylett

  I started receiving a large (for me) amount of traffic on one of my pages yesterday. Today, I thought that it would be useful to track goals from that page -- there's a link to my blog from it. I added the 'visited external link' goal to Piwik, and new visits are being recorded. However, it seems to me that there must be enough data in the database to retroactively apply the goal to past users -- is there a way to achieve that?.

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• How can I create multiple mini-sites with similar/duplicate content without hurting my search engine rank?

  - by ekpyrotic

  Essential background: I run a small company that lets members of the public post handwritten letters to their local politician (UK-based). Every week a number of early stage bills (called Early Day Motions) are submitted for debate in the House of Commons, and supporters of the motion will contact their local Members of Parliament, asking them to sign the motion. The crux: I want to target these EDMs with customised mini-sites, so when people search "EDM xxx", they find my customised mini-site, specifically targeting that EDM (i.e., "Send a handwritten letter to your MP asking them to sign EDM xxx"). At the moment, all these mini-sites (and my homepage) have duplicate content with only the relevant EDM name, number, and background image changed. (For example, http://mailmymp.com and http://mailmymp.com/edm/teaching-life-saving-skills-at-school-edm-550.php). The question: Firstly, will this hurt my potential search engine ranking? And, if so, what's the best way to target these political campaigns in an efficient manner without hurting my SEO prospects?

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• Does the .ending on a domain need to be relevant? [closed]

  - by Mat Doidge

  Possible Duplicate: Does Google penalize .me or .tv sites? I see a lot of people now opting to use myname.im or myname.me But after doing some checking, i found that .im domain names are meant to be Isle of Man endings. Is this correct, and does it matter that people opt to use this domain ending if they are not even based anywhere near the Isle of Man. It is Ok to use a domain ending purely for how good it sounds is what I'm really after. Or is it bad practice to do this.

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• Create a filter to consider http://example.com/foo/bar as http://example.com/index.php/foo/bar

  - by magnetik

  I'm using URL rewriting to make my url http://example.com/foo/bar/ to http://example.com/index.php/foo/bar. I'm not linking the index.php/.. url anywhere, but for some reasons, some users arrives to the index.php url. In Google analytics, I have a lot of duplicates that are quite annoying to follow up the traffic. I've watched the Advanced filters but I'm struggling to make it works fine. Any regex and google analytics pro to help me out ?

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• Kinect joint coordinates and XNA animation

  - by Sweta Dwivedi

  I have written a program to record the x,y,z coordinated of the Hand joint and I want to animate my models 2D or 3D according to these coordinates. . .However the output of the x,y,z coordinates are fluctuating from -0 to 1 but not more than that.. So i assume I will need to multiply them back with the screen width and height, however it still doesnt seem to animate according to the original x,y,z points Any transformations I might be missing out? while ((line = r.ReadLine()) != null) { string[] temp = line.Split(','); int x = (int) float.Parse(temp[0]))* maxWidth); int y = (int) float.Parse(temp[1])) * maxHeight); }

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• Sprite batching seems slow

  - by Dekowta

  I have implemented a sprite batching system in OpenGL which will batch sprites based on their texture. How ever when I'm rendering ~5000 sprites all using the same texture i'm getting roughly 30fps. The process is as followed create sprite batch which also create a VBO with a set size and also creates the shaders as well call begin and initialise the render mode (at the moment just setting alpha on) call Draw with a sprite. This checks to see if the texture of the sprite has already been loaded and if so it just creates a pointer to the batch item and adds the new sprite coords. If not then it creates a new batch item and adds the sprite coords to that; it adds the batch item to the main batch. if the max sprite count is reached render will be called call end which calls render to render the left over sprites in the batch. and also resets the buffer offset render loops through each item in the batch and will bind the texture of the batch item, map the data to the buffer and then draw the array. the buffer will then be offset by the amount of sprites drawn. I have a feeling that it could be the method i'm using to store the batched sprites or it could be something else that i'm missing but I still can work it out. the cpp and h files are as followed http://pastebin.com/ZAytErGB http://pastebin.com/iCB608tA On top of this i'm also getting a weird issue where then two sprites are batched on after the other the second sprite will use the same coordinates as the last. And then when one if drawn after it is fine. I can't seem to find what is causing this issue. any help would be appreciated iv been sat trying to work this all out for a while now and cant seems to put my finger on what's causing it all.

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• Is finding graph minors without single node pinch points possible?

  - by Alturis

  Is it possible to robustly find all the graph minors within an arbitrary node graph where the pinch points are generally not single nodes? I have read some other posts on here about how to break up your graph into a Hamiltonian cycle and then from that find the graph minors but it seems to be such an algorithm would require that each "room" had "doorways" consisting of single nodes. To explain a bit more a visual aid is necessary. Lets say the nodes below are an example of the typical node graph. What I am looking for is a way to automatically find the different colored regions of the graph (or graph minors)

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