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Articles indexed in June 2014

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• How can I put Fedora GUI onto Ubuntu?

  - by Dareleth

  Okay, I'm pretty new to Linux-based systems, so if I say something wrong or ask something dumb, please bear with me. I have a project for school that requires some extensive work inside of the latest version of Fedora including screenshots of rather specific things. The VM system at my school runs Fedora 20 like a snail high on paint fumes, and my laptop's VirtualBox doesn't recognize the ISO I got from the official Fedora site, so I feel like I'm out of alternatives aside from formatting over Ubuntu. I'd rather not do that, as I rather enjoy this distro. I am running Ubuntu 14.04 on my laptop. At my login screen, I have the much appreciated option of selecting between a couple of GUI's--specifically, Ubuntu, GNOME, and Cinnamon. I would like to get the Fedora GUI added to this list, but I don't know where to start or if it's even an option. Any and all help is appreciated.

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• Wireless is connected, but can't browse the Internet (or connection goes completely)

  - by user261007

  I'd like some help with this, please. Will be very glad is anyone will point me in the right direction. Thank you in advance! This is when the connection is present and browsing: eth0 Link encap:Ethernet HWaddr 50:46:5d:4a:9e:4f UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:2666 errors:0 dropped:0 overruns:0 frame:0 TX packets:2666 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:228844 (228.8 KB) TX bytes:228844 (228.8 KB) wlan0 Link encap:Ethernet HWaddr dc:85:de:1c:91:f9 inet addr:192.168.1.147 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::de85:deff:fe1c:91f9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:18780 errors:0 dropped:0 overruns:0 frame:0 TX packets:12817 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:21198762 (21.1 MB) TX bytes:1746891 (1.7 MB) When connection goes: wlan0 Link encap:Ethernet HWaddr dc:85:de:1c:91:f9 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:209503 errors:0 dropped:0 overruns:0 frame:0 TX packets:132560 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:268811733 (268.8 MB) TX bytes:15479814 (15.4 MB)

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• grub rescue error, [on hold]

  - by Lucas Smith

  I was trying to install a Linux OS to an partition alongside Windows 8 and Ubuntu, but I got confused and I just canceled the installation. Then I booted into Windows 8 and deleted the 20GB partition that I created. When I restarted the computer I got stuck at the following error message: error: no such partition grub rescue> I don't know what to do. I do not want to lose any data. Please help! Sorry for not selecting any answers, I overrited Linux with Windows XP and then repaired the Master Boot Record for Windows 8 and deleted XP, I'm now staying at Windows 8.

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• sudo: /usr/lib/sudo/sudoers.so must be owned by uid 0

  - by 7UR7L3

  Whenever I try to do anything at all that requires my password it returns this: u7ur7l3@ubuntu:~$ sudo sudo: /usr/lib/sudo/sudoers.so must be owned by uid 0 sudo: fatal error, unable to load plugins u7ur7l3@ubuntu:~$ So I can't install anything from the Software Center / package manager or run any commands in terminal that require my password. I can log in, but that's pretty much it. I accidentally changed the permissions of some files, then changed some more trying to fix it :/. Now I'm completely lost as to what to do. This is what happened when I tried to get sudo working again using pkexec: u7ur7l3@ubuntu:~$ pkexec chown root /usr/lib/sudo/sudoers.so Error getting authority: Error initializing authority: Error calling StartServiceByName for org.freedesktop.PolicyKit1: GDBus.Error:org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program /usr/lib/dbus-1.0/dbus-daemon-launch-helper: Success u7ur7l3@ubuntu:~$ sudo ls sudo: /usr/lib/sudo/sudoers.so must be owned by uid 0 sudo: fatal error, unable to load plugins And to change permissions I was using Root Actions as a dolphin service/ plugin thing, so history doesn't show me the permission changes. I just realized that sounds don't work at all anymore. When I go into Phonon my default settings and playback devices aren't even there. Also I don't have the option to shutdown, I can only log out or leave.

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• How come many of the AppShowdown apps aren't available in Ubuntu anymore?

  - by kermit666

  After upgrading to 12.10 I've noticed that I can't install some of the nice apps created for the AppShowdown, such as: Cuttlefish Blubphone (Lightread also came out quite late in 12.10) It seems such a waste having these great new apps added to the repository, only to exclude them in the first next version. I'm wondering why aren't these apps automatically available in a newer version of Ubuntu. Is it simply that the API is so different that it requires major rewrites and programmer activity or is it some bureaucratic reason? Are there any plans to improve this process?

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• How do i share files between my ubuntu host and xp pro virtual machine? [duplicate]

  - by jake

  Possible Duplicate: Shared folders in XP virtualbox guest I'm using Virtualbox 4.1.8 to run Windows XP PRO. I have ironed out all other kinks on my own but I still can't access a file share. The sole purpose of running a VM is to get iTunes for my iPhone but I can't get to my music file from my guest OS, I'm also new to Ubuntu so im not sure if I have done all the updates right or not, any would be welcome

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• How to make a jar file run on startup & and when you log out?

  - by RanZilber

  I have no idea where to start looking. I've been reading about daemons and didn't understand the concept. More details : I've been writing a crawler which never stops and crawlers over RSS in the internet. The crawler has been written in java - therefore its a jar right now. I'm an administrator on a machine that has Ubuntu 11.04 . There is some chances for the machine to crash , so I'd like the crawler to run every time you startup the machine. Furthermore, I'd like it to keep running even when i logged out. I'm not sure this is possible, but most of the time I'm logged out, and I still want to it crawl. Any ideas? Can someone point me in the right direction? Just looking for the simplest solution.

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• Where can I get the 11.04 kernel .config file?

  - by Oli

  I'm using Maverick with the latest available kernels on kernel.org and building them myself. Until now I've been basing my configuration off the stock Maverick kernel and accepting the make oldconfig defaults. I've been doing this for 3 major releases now so I figure I'm starting to slip behind the current "standard". I would like to re-base my kernels off the new Natty .config file. Is this available somewhere online or do I have to download the whole kernel package and extract it? Edit: I've manually pulled in the config from the latest Natty kernel package and I can confirm that I propbably should have done this sooner. A lot of differences between my old "evolved" config and the Natty default. Now if I could just do this without 20 minutes of hunting and downloading the package so I can re-base in the future.

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• Google Analytics: understanding dimensions and metrics?

  - by flossfan

  If I run a query on the Google Analytics API and set the dimension to ga:pagePathLevel1 and the metric to ga:avgTimeOnPage, I get results like this: { pagePathLevel1: /about, avgTimeOnPage: 28 }, { pagePathLevel1: /contact, avgTimeOnPage: 10 } I'm not completely sure how to interpret this. Is the value of avgTimeOnPage the average time spent by any user on all pages that match that path? Or is 28 seconds the average time spent by any user on any single page that matches that path? I'm looking for the average time spent across all pages matching that path, but the time estimates look shorter than I'd expect. I hope that question makes sense! Please tell me if it doesn't.

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• Determining if a visitor left your server

  - by Jeepstone

  We have an Apache server running a PHP website. The site is an e-commerce shop. We currently use Barclays as the payment provider but are seeing a lot of customers drop out at the point at which we transfer them to the payment gateway (hosted with Barclays) I can see specific instances in the shop where orders have been created but not paid/failed but I need to ascertain if the user has definitely left our server (or just failed to reach Barclays). Is there anything in any of the server/access logs that states when a user transferred to a different domain?

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• Besxt Text-to-Speech Solution for my Website

  - by Tim Marshall

  I'm working on the 'Ease of Access' section of my website with the options to increase the font-size displayed on pages to a minimum, invert colours and whatnot. I wish to implement a plugin which, if enabled by the user, to read content on my website. Presumably my best option is a website plugin, however there might be some programming I've not come across which allows the likes of PHP to read content. I'm not entirely sure how this all works. Best Regards, Tim

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• Can 302 redirect on wordpress homepage affect SEO?

  - by user2402116

  I manage a website. In order to lead the visitor to the latest post when entering the website, I set a 302 redirect from the homepage URL to the latest post URL. There's 1 to 2 posts a month so the redirection is made manually each time a new post gets published. Despite the website registration on google it doesn't get indexed at all. After searching for some solution on blogs and forums I understood this issue might be related to the 302 redirection. It's the first time I use redirections on a website, can someone help me?

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• Best way to move site from subdomain to root through cPanel?

  - by Mbbc

  I have an old Wordpress blog hosted on a subdomain (sub.mysite.com) with hundreds of posts. The root domain is actually empty and redirected to the subdomain. Now I want to move the site from the subdomain to the root domain. I found some .htaccess examples like this: RewriteEngine on RewriteCond %{HTTP_HOST} ^sub.example.com$ RewriteRule ^(.*)$ http://example.com/$1 [R=301,L] This redirection seems to work if I clone or move the subdomain site into the root domain but, Is there an easier way? I mean, just like when you redirect from www. to non-www. and you only have one site installation. The site would be kept installed on subdomain folder but it would be accessed from root domain, is it possible?

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• Tumblr Custom URL Not Working

  - by user3177012

  I have bought a domain that I want to use as a unique Tumblr website but I can't get the url to pick up on Tumblr settings. The domain is a .com registered with 123-reg. I've set the CNAME to the correct tumblr url and also set the A record too. When I visit the url I get the Tumblr error page so I know that the domain is pointing, however when I go to settings in Tumblr and "Test" the url it says that it's not pointing and I can't save it. What could be the problem?

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• Why are 20% of keywords still provided when Google is using HTTPS across the board?

  - by Rajesh Magar

  Most of the searches that appear in my analytics are "not provided" because Google has encrypted their all searches. However, if all search results are now encrypted with HTTPS protocol then how is Google analytics still able to track some (20%) of the organic keywords details? There are still some keywords appearing in my organic keywords section. So how did Google analytics do this tracking? Does it bypass the HTTPS restrictions for the referrer?

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• Is it better to have AWS EC2 and RDS is the same Availability Zone?

  - by Dan

  I run a web app in an AWS EC2 instance and the database for the app in an RDS instance both in Amazon Web Services Region East-1. However, one of them is in Availability Zone 1a and the other is in 1d. Am I getting all the speed benefits of having both instances in the same "data center" (East-1) even if they are in different Availability Zones, or can I optimize by moving them to the same Availability Zone?

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• Using .htaccess, can you hide the true URL?

  - by Richard Muthwill

  So I have a web hotel with 1 main website http://www.myrootsite.com/ and a few websites in subdirectories, in a folder called projects. I have domain names pointing to the subdirectories, but when holding the mouse over a link in those websites the URLs are shown as: http://www.myrootsite.com/projects/mysubsite/contact.html When I'm on mysubsite.com I want them to be shown as: http://www.mysubsite.com/contact.html I spoke to support for the web hotel and the guy said try using .htaccess, but I'm not sure exactly how to do this. Thank you very much for your time! Edit: For more information My website is: http://www.example1.com/ and I also own http://www.example2.com/. All of example2.com's files are in: example1.com/projects/example2/. When you visit example2.com, you'll notice all of the URL's point towards: example1.com/projects/example2/ but I want them to point towards: example2.com/ Can this be done? I hope this is enough info for you to go on :). Edit: For w3d I go to the url mysubsite.com and the browser shows the url mysubsite.com. The services I'm using create an iframe around myrootsite.com and use the url mysubsite.com I just hate that in Firefox and Internet Explorer, holding the mouse over link show that the destination url is: myrootsite.com/projects/mysubsite/...

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• Access a PLESK website before propagation?

  - by RCNeil

  My web host uses Plesk and I want to know if there is anyway to access and view a website (with PHP and other processes being functional) without propagation of the domain name? I have found countless forums on this but they are all pretty old (circa 01-04) and involve either tricking your localhost or SSH commands and some even result in terrible security risks. I would like to access a web page directory through a browser and see it's contents while having the PHP processes carry out... before I propagate it's potential domain name. People claim this is pointless but during a site migration why on earth would you not test a site before propagating it? I'm looking for something similar to what cPanel offers i.e. http://IP.ADDRESS./~mydomain.com The only solution I could think of is storing the site in a new directory of an already functional site and then setting up databases and testing the site once it's complete. Once tested and working I should be easily be able to migrate the files to the "new" domain name's root directory and just setup a new databases and then propagate the domain name. I can't believe that Plesk V10+ still does not have a site preview method that includes PHP, JS, and Flash ability.

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• Textures selectively not applying in Unity

  - by user46790

  On certain imported objects (fbx) in Unity, upon applying a material, only the base colour of the material is applied, with none of the tiled texture showing. This isn't universal; on a test model only some submeshes didn't show the texture, while some did. I have tried every combination of import/calculate normals/tangents to no avail. FYI I'm not exactly experienced with the software or gamedev in general; this is to make a small static scene with 3-4 objects max. One model tested was created in 3DSMax, the other in Blender. I've had this happen on every export from Blender, but only some submeshes from the 3DSMax model (internet sourced to test the problem)

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• Simple 3D Physics engine as a part of graduation project [on hold]

  - by Eugene Kolesnikov

  I am working on my graduation project and one part of it is to simulate the motion of a rigid body in 3D space. I can use either already written physics engine or to write it myself. It's quite an interesting challenge for me, so I would like to do it myself. I am able to use either C++ or Java for programming (prefer C++). I am using Mac OS X and Debian 7. Could you suggest any guides or tutorials how to do it, can't find it anywhere... More precisely, I need a very simple engine, without collision detection, and many other things that I do not know, I just need to calculate the forces and move my body, depending on the resultant force. If you think that this task is still very difficult or there is no such tutorial, please suggest me some good and simple engine.

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• (Libgdx) Move Vector2 along angle?

  - by gemurdock

  I have seen several answers on here about moving along angle, but I can't seem to get this to work properly for me and I am new to LibGDX... just trying to learn. These are my Vector2's that I am using for this function. public Vector2 position = new Vector2(); public Vector2 velocity = new Vector2(); public Vector2 movement = new Vector2(); public Vector2 direction = new Vector2(); Here is the function that I use to move the position vector along an angle. setLocation() just sets the new location of the image. public void move(float delta, float degrees) { position.set(image.getX() + image.getWidth() / 2, image.getY() + image.getHeight() / 2); direction.set((float) Math.cos(degrees), (float) Math.sin(degrees)).nor(); velocity.set(direction).scl(speed); movement.set(velocity).scl(delta); position.add(movement); setLocation(position.x, position.y); // Sets location of image } I get a lot of different angles with this, just not the correct angles. How should I change this function to move a Vector2 along an angle using the Vector2 class from com.badlogic.gdx.math.Vector2 within the LibGDX library? I found this answer, but not sure how to implement it. Update: I figured out part of the issue. Should convert degrees to radians. However, the angle of 0 degrees is towards the right. Is there any way to fix this? As I shouldn't have to add 90 to degrees in order to have correct heading. New code is below public void move(float delta, float degrees) { degrees += 90; // Set degrees to correct heading, shouldn't have to do this position.set(image.getX() + image.getWidth() / 2, image.getY() + image.getHeight() / 2); direction.set(MathUtils.cos(degrees * MathUtils.degreesToRadians), MathUtils.sin(degrees * MathUtils.degreesToRadians)).nor(); velocity.set(direction).scl(speed); movement.set(velocity).scl(delta); position.add(movement); setLocation(position.x, position.y); }

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• Am I missing something about these considerations about Leaderboard's database's schema?

  - by misiMe

  I just finished to develop a mobile game, now I want to implement an online leaerboard using mysql. I'm wondering about the database's schema, I thought about some possibilities: (I didn't got in detail with syntax because my question is just about the logic of it) Name: string; Score: integer I thought to ask the name just the first time. If, in the future, you will modify that, it will call just an update to the name associated with your id. Leaderboard(ID, Name, Score) ID: integer autoincrement, PrimaryKey With this kind of idea maybe the db will grow fast because if you choose everytime a different name for the score, it will add a new entry. Leaderboard(PhoneId, Name, Score) Here PhoneId will be the unique identifier of the phone, PrimaryKey. A con of this choice is that if you want to play with your friends' phone, you can't put a different name for the score. Leaderboard(Name, Score) Here Name is PrimaryKey. With that, if you enter a name that already exists, you will be prompted to choose another one. Do you agree with this considerations? What will you do? Am I missing something?

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• Convex Hull for Concave Objects

  - by Lighthink

  I want to implement GJK and I want it to handle concave shapes too (almost all my shapes are concave). I've thought of decomposing the concave shape into convex shapes and then building a hierarchical tree out of convex shapes, but I do not know how to do it. Nothing I could find on the Internet about it wasn't satisfying my needs, so maybe someone can point me in the right direction or give a full explanation.

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• Wall jumping collision detection anomaly

  - by Nanor

  I'm creating a game where the player ascends a tower by wall jumping his way to the top. When the player has collided with the right wall they can only jump left and vice versa. Here is my current implementation: if(wallCollision() == "left"){ player.setPosX(0); player.setVelX(0); ignoreCollisions = true; player.setCanJump(true); player.setFacingLeft(false); } else if (wallCollision() == "right"){ player.setPosX(screenWidth-playerWidth*2); player.setVelX(0); ignoreCollisions = true; player.setCanJump(true); player.setFacingLeft(true); } else{ player.setVelY(player.getVelY() + gravity); } and private String wallCollision(){ if(player.getPosX() < playerWidth && !ignoreCollisions) return "left"; else if(player.getPosX() > screenWidth - playerWidth*2 && !ignoreCollisions) return "right"; else{ timeToJump += Gdx.graphics.getDeltaTime(); if(timeToJump > 0.50f){ timeToJump = 0; ignoreCollisions = false; } return "jumping"; } } If the player is colliding with the left wall it will switch between the states left and jumping repeatedly due to the varible ignoreCollisions being switched repeatedly in collision checks. This will give a chance to either jump as intended or simply ascend vertically instead of diagonally. I can't figure out an implementation that will reliably make sure the player jumps as intended. Does anyone have any pointers?

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• Integration error in high velocity

  - by Elektito

  I've implemented a simple simulation of two planets (simple 2D disks really) in which the only force is gravity and there is also collision detection/response (collisions are completely elastic). I can launch one planet into orbit of the other just fine. The collision detection code though does not work so well. I noticed that when one planet hits the other in a free fall it speeds backward and goes much higher than its original position. Some poking around convinced me that the simplistic Euler integration is causing the error. Consider this case. One object has a mass of 1kg and the other has a mass equal to earth. Say the object is 10 meters above ground. Assume that our dt (delta t) is 1 second. The object goes to the height of 9 meters at the end of the first iteration, 7 at the end of the second, 4 at the end of the third and 0 at the end of the fourth iteration. At this points it hits the ground and bounces back with the speed of 10 meters per second. The problem is with dt=1, on the first iteration it bounces back to a height of 10. It takes several more steps to make the object change its course. So my question is, what integration method can I use which fixes this problem. Should I split dt to smaller pieces when velocity is high? Or should I use another method altogether? What method do you suggest? EDIT: You can see the source code here at github:https://github.com/elektito/diskworld/

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