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• Problem Trying to Install ROOT (by CERN) on Ubuntu 11.04 i386

  - by Jose Luis

  I hope you can help me with this problem I am trying to install root in my computer, but I have a problem and I don't know what to do to solve it I've downloaded the tar file with the root version that I want to install I've extracted the files in the tar file I've run the configure program succesfully, but when I run "make" command I get this result: cp /root/root/core/utils/src/RClStl.cxx core/utils/src/RClStl_tmp.cxx bin/rmkdepend -R -fcore/utils/src/RClStl_tmp.d -Y -w 1000 -- -pipe -m32 -Wall -W -Woverloaded-virtual -fPIC -Iinclude -DR__HAVE_CONFIG -pthread -UR__HAVE_CONFIG -DROOTBUILD -I/root/root/core/utils/src -D__cplusplus -- core/utils/src/RClStl_tmp.cxx g++ -O2 -pipe -m32 -Wall -W -Woverloaded-virtual -fPIC -Iinclude -DR__HAVE_CONFIG -pthread -UR__HAVE_CONFIG -DROOTBUILD -I/root/root/core/utils/src -o core/utils/src/RClStl_tmp.o -c core/utils/src/RClStl_tmp.cxx In file included from core/utils/src/RClStl.h:28:0, from core/utils/src/RClStl_tmp.cxx:16: core/utils/src/Scanner.h:16:27: fatal error: clang/AST/AST.h: No existe el fichero o el directorio compilation terminated. make: * [core/utils/src/RClStl_tmp.o] Error 1 rm core/utils/src/RClStl_tmp.cxx I don´t know what to do Please, help me thank you in advance

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• What is upcasting/downcasting?

  - by acidzombie24

  When learning about polymorphism you commonly see something like this class Base { int prv_member; virtual void fn(){} } class Derived : Base { int more_data; virtual void fn(){} } What is upcasting or downcasting? Is (Derived*)base_ptr; an upcast or downcast? I call it upcast because you are going away from the base into something more specific. Other people told me it is a downcast because you are going down a hierarchy into something specific with the top being the root. But other people seem to call it what i call it. When converting a base ptr to a derived ptr is it called upcasting or downcasting? and if someone can link to an official source or explain why its called that than great.

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• How do I create a 12.04 LiveUSB for a non-PAE machine?

  - by DrSkylaser

  I'm trying to create a dual-boot laptop with Ubuntu 12.04 and some flavor of Windows (TBD). To do that, I need to do some work on partitions & install 12.04. To do that, I need to create a bootable USB that will work with my non-PAE-capable CPU. Someone pointed me to a mini.iso that was allegedly non-PAE-friendly, but it gave me the same error as the straightup 12.04 desktop ISO. What version do I actually need? (This isn't going to be a virtual machine--I don't think the laptop has the RAM to handle that happily--so enabling PAE in the virtual machineware doesn't help me.)

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• Public versus private inheritance when some of the parent's methods need to be exposed?

  - by Vorac

  Public inheritance means that all fields from the base class retain their declared visibility, while private means that they are forced to 'private' within the derived class's scope. What should be done if some of the parent's members (say, methods) need to be publicly exposed? I can think of two solution. Public inheritance somewhat breaks encapsulation. Furthermore, when you need to find out where is the method foo() defined, one needs to look at a chain of base classes. Private inheritance solves these problems, but introduces burden to write wrappers (more text). Which might be a good thing in the line of verbosity, but makes changes of interfaces incredibly cumbersome. What considerations am I missing? What constraints on the type of project are important? How to choose between the two (I am not even mentioning 'protected')? Note that I am targeting non-virtual methods. There isn't such a discussion for virtual methods (or is there).

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• I loose some directories when i upgrade from Ubuntu 11.10 to 12.04

  - by maythux

  last day i upgraded my ubunut 11.10 desktop to ubuntu 12.04. I was running a KVM virtual about 7 machines and managed by virt-manage software.... anyway when i finished upgrading i found that virt-manager is not working so i have to reconfigure it again and install some other missing packages that was deleted!!!! anyway i solve this issue...then i started to restore my virtual machines i restore 2 machines without any problems the third and fourth ones (windows) make a check disk that takes more that 6 hours but finally it works... other machines i cant find their attached hard disks i don't know what happens but i cant found that files. 1- upgrading delete files!?!! 2- Is there anyway to restore those files? thanks in advance

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• Welcome to our Friday tips series!

  - by Chris Kawalek

  Today we're starting a brand new blog series. For your Friday afternoon reading, we'll be posting a technical tip or question and answer on a technical topic. We'll start by introducing ideas on our own, but we'd really like it if you were involved and asked us questions via Twitter! Tag your tweet with #AskOracleVirtualization and we'll consider your question for the blog. Today's tip is on Storage and Oracle Virtual Desktop Infrastructure: Question: I run Oracle Virtual Desktop 3.4.1 on Solaris and use a local ZFS storage pool.  How should I configure my ZFS ARC cache?  Answer by John Renko, Consulting Developer, Oracle: Oracle recommends about 5G of ARC cache per template in use to achieve up to a 90% disk read offload. Set your ARC min=max to reserve the maximum amount of your remaining memory for your running VMs. In /etc/system: set zfs:zfs_arc_min = 5368709120 set zfs:zfs_arc_max = 5368709120 The amount you need to reserve will depend on your template but this has proven to be a great start for a typical windows 7 VM running productivity applications.

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• Ubuntu boots into terminal

  - by DKuntz2

  When I turn on my computer (a CR-48), I keep loading tty1. I have tried xstart, and all I get is: Fatal server error: Could not create lock file in /tmp/.tX0-lock When I attempted to make the directory (both sudo and not), I received these two errors: sudo: Can't open /var/lib/sudo/don/tty2: Read-only file system (I've gotten other tty's for different virtual terminals) mkdir: cannot create directory '/tmp/tX0-lock': Read-only file system Before I got to the only terminal state, I had the computer moving a few files from a network server to the computer, I put it to sleep without stopping the transfers, and started the computer again away from my home network, and attempted to stop the transfers, the computer than restarted. Running sudo reboot puts me right back in the virtual terminal, and I can't get into any sort of x application.

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• Problem with WindowsXp on VirtualBox in 12.10

  - by umpirsky

  When I try to start it I get: Failed to open a session for the virtual machine WindowsXp. The virtual machine 'WindowsXp' has terminated unexpectedly during startup with exit code 1. Result Code: NS_ERROR_FAILURE (0x80004005) Component: Machine Interface: IMachine {5eaa9319-62fc-4b0a-843c-0cb1940f8a91} and in another dialog: Kernel driver not installed (rc=-1908) The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module by executing '/etc/init.d/vboxdrv setup' as root. If it is available in your distribution, you should install the DKMS package first. This package keeps track of Linux kernel changes and recompiles the vboxdrv kernel module if necessary. When I try to run: $ sudo /etc/init.d/vboxdrv setup [sudo] password for umpirsky: sudo: /etc/init.d/vboxdrv: command not found Any idea?

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• Setting up a GUI-based libvirt VM

  - by LibertasMens

  I am attempting to create a virtual machine using libvirt that will have a GNOME GUI and remote accessibility. I have successfully set up the VM to run, but I am unable to access it remotely. The command issued to build the VM: sudo vmbuilder kvm ubuntu --suite=precise --flavour=generic --arch=amd64 --mirror=http://de.archive.ubuntu.com/ubuntu -o --libvirt=qemu:///system --part=/usr/xxxx/vmbuilder.partition --templates=/usr/xxxx/mytemplates --addpkg=nano --addpkg=unattended-upgrades --addpkg=acpid --firstboot=/usr/xxxx/boot.sh --cpus=2 --mem=4096--user=xxxx --name=xxxx --pass=xxxx --hostname=xxxx --bridge=br0 My intent is to have a virtual machine that my client can remotely access with a GUI.

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• Partitions: "Partition Virtually"

  Save space by deactivating index partitions, and use virtual columns to partition more logically.

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• OpenWonderland goes to Europe

  - by user12652314

  Past my day job, I also have the privilege of being Vice President and Member of the Board of the OpenWonderland Foundation (Formerly Project Wonderland for ex-Sun folks). It's great to see the progress Wonderland is making as the platform-of-choice for open source collaborative 3-D virtual worlds built in Java. The upcoming and first european IE Summit in Madrid will show a number of projects and innovations for virtual and game-based learning. I also dropped Ultan a note after learning about the Gamification of Oracle Apps to see if collaborating with kids and schools is an area we can work together on to improve kids engagement and learning experiences online. Stay tuned.

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• package update in ubuntu on vitual box

  - by Ayusman

  while following one of the tutorials I needed to install a curl package. Here are my system configuration: Virtualbox 4.1 on Windows 7 64 bit. I have installed ubuntu 12.04 on the virtual box. When I try the following: sudo apt-get install curl I see the following errors: [sudo] password for userMe: Reading package lists... Done Building dependency tree Reading state information... Done Package curl is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'curl' has no installation candidate userMe@userMe-ubuntu:~$ When I try the same on a direct installation of ubuntu on a laptop (not a virtual machine) there is no problem. I am assuming this may be because of network settings. Please note that my work PC is in a corporate network and uses auto proxy settings (using a .pac file) for internet access etc. Any help will be appreciated.

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• Is the tap-to-click issue solved

  - by AWE

  I'm just an average Joe when it comes to computing (maybe less then the average Joe) but I hate tap-to-click. In system and settings there is no touchpad tab? Is it true that this has been fixed? I'm using Dell inspiron N5110 xinput list: ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? PS/2 Generic Mouse id=13 [slave pointer (2)] This is really strange because Dell is one of the top manufacturers in laptops and Ubuntu one of the top distros in Linux and Canonical claims that they are working closely with Dell.

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• GlassFish 4.0 Virtualization Progress - VirtualBox

  - by alexismp

  Wouldn't it be nice if you could spawn GlassFish instances as VirtualBox virtual machines? Well now with early versions of GlassFish 4.0 you can! This page on the GlassFish Wiki documents the steps to get this to work. It walks you through the various VirtualBox (network and services) and GlassFish configuration steps including the creation of VDI templates (typically JeOS images) to finally create a virtual machine on the fly, as part of the typical GlassFish deployment process. The more general virtualization support in GlassFish is discussed in this other Wiki page. Earlier demonstrations of GlassFish.next prototypes or early milestone builds showed support for KVM, "laptop mode" and OVM as well as community involvement from Serli, speaking of which this slide-deck is a good summary of what we're trying to achieve in the GlassFish 4.0 IMS (IaaS Management Service).

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• Citrix SDK: Where to start? [closed]

  - by Bob Dole

  I'm needing to start hacking around the Citrix SDK and am trying to figure out where to start. I'm wanting to basically find a way to pass data from the client to the server and figure out how to open an application on the citrix client. I see there is a XenApp SDK, and Virtual Channel SDK but really don't know which one I need to start with. I have a Citrix development virtual server set up, but am unsure how to get started. Does someone know of a good site/tutorial on how to get started with the various Citrix API's quickly?

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• Allow visitor to print something they bought only 1 time

  - by steakbbq

  I am doing a website that needs to only let the customer print out what they bought 1 time. There are websites that currently do this and they mentioned Adobe Flash Player, Adobe AIR and the Sheet Music Plus AIR application. We would need to block programs like adobe distillation and any virtual printers while only allowing an instant print after purchase. I am not an adobe air developer. Would their be any other ways to accomplish this and what would be the easiest. Thank you. Would their be a way to not allow printing to a virtual printer ie adobe pdf?

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• Dell b1160w not working in 14.04

  - by mission007

  I originally installed the dell b1160w printer on ubuntu 12.04. It worked as expected. A few months ago I upgraded to ubuntu 14.04 and now I can't get the printer to work. I looked at the driver information on the dell site. They have not updated their driver since 2013 so 12.04 is the latest version with a supported driver. Is there a work around for this problem, like a generic driver that I can use or a way to install whatever printer interface ubuntu 12.04 was using? I have a windows virtual box. I can get it to work through there, but it's inconvenient to pull up my virtual box and transfer the files over to it anytime I want to print.

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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• Am I violating LSP if the condition can be checked?

  - by William

  This base class for some shapes I have in my game looks like this. Some of the shapes can be resized, some of them can not. private Shape shape; public virtual void SetSizeOfShape(int x, int y) { if (CanResize()){ shape.Width = x; shape.Height = y; } else { throw new Exception("You cannot resize this shape"); } } public virtual bool CanResize() { return true; } In a sub class of a shape that I don't ever want to resize I am overriding the CanResize() method so a piece of client code can check before calling the SetSizeOfShape() method. public override bool CanResize() { return false; } Here's how it might look in my client code: public void DoSomething(Shape s) { if(s.CanResize()){ s.SetSizeOfShape(50, 70); } } Is this violating LSP?

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• ideas on multiplayer games which include lots of collaboration?

  - by user494461

  For my master thesis I wanted to design a small multiplayer game which includes more than one player(maybe 5), has 2-3 players collaborating at a time to achieve some task. The most important thing is realistic simulation of the movable objects in the scene which more than one player should simultaneously interact with. I would also prefer large virtual environments (VEs) like mmogs where groups of players are interacting in different areas of the VE. tasks for players should include 2-3 players touching movable objects at same time. e,g, a very basic task can be users lifting a cube together and pushing it through a hole I am not new to designing virtual environments with openGL, but have never designed games before and rarely play other than few of my favorite ones like Fifa. I wanted some ideas on what kind of games should I look at which should help me with ideas for my tasks for the users to gain points and win in games? any current indie games which might inspire me?

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• What is the point in using real time?

  - by bobobobo

  I understand that using real time frame elapses (which should vary between 16-17ms on average) are provided by a lot of frameworks. GetTimeElapsedSinceLastFrame, and it gives you the wall clock time. But should we use this information in basic physics simulation? It looks to me to be a bad idea. Say there is a slight lag on the machine, for whatever reason (say a virus scanner starts up). The calculations all jump, and there is no need for this. Why not use a virtual second and ignore wall clock time? For gameplay on the level of Commander Keen, shouldn't you always use the virtual second and not real-time? (Besides stopwatch timing for race games) I don't see a need to use real time and not a fixed 16ms time step.

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• Register now! Oracle SDN: Software-Defined Networking in a Hybrid, Open Data Center

  - by uwes

  Take the opportunity and learn more about Oracle SDN and  OVCA in this upcoming webcast. Title: Oracle SDN: Software-Defined Networking in a Hybrid, Open Data Center Date: 19th of November 10:00 a.m. PT Speakers: S.K. Vinod and Charlie Boyle Topics that will be covered: - the benefits of Oracle SDN - how Oracle SDN interoperates with existing overlay constructs - how Oracle SDN is different from other SDNs in the market We will also discover how Oracle Virtual Networking is integrated into the latest Engineered System, Oracle Virtual Compute Appliance Click her to register The webinar will be recorded. Register to get informed when the replay is a vailable.

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• Eclipse: AVD not appearing

  - by dgood1

  I have installed the ADT bundle for 32 bit. Using Ubuntu 12.04 Updated it a bit and installed the 2.3.3 Android version. I have Eclipse Indigo. When I use the Android Virtual Machine manager, after choosing a device, I get the progress bar after pressing "Start" but it disappears when it finishes and no virtual machine appears. No errors, too. I fear it would be a problem with my RAM (Laptop's = 512(or less). Allocated to Device = 128 - 300), having been told by a teacher that the emulator requires 2 GB RAM. I would like confirmation and/or solution.

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• Is it possible to lose some directories when upgrading from 11.10 to 12.04?

  - by maythux

  Last day I upgraded my Ubuntu 11.10 desktop to Ubuntu 12.04. I was running a KVM virtual about 7 machines and managed by virt-manage software. Anyway when I finished upgrading I found that virt-manager is not working. So I had to reconfigure it again and install some other missing packages that was deleted! Eventually, I managed to solve this issue. Then I started to restore my virtual machines. I restored 2 machines without any problems. The third and fourth ones (Windows) made a check disk that lasted more that 6 hours but finally it worked. Other machines I can't find their attached hard disks. I don't know what happened but I can't find those files. Does upgrading delete files? Is there anyway to restore those files?

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• Cloud consolidation handling multi databases

  - by llaszews

  I have spoken about virtualization and the different types of virtualization. Which includes OS zones, application server domains, database schemas, VLANS and other approaches. Another approach is to create a virtually federated database in the cloud. DBSpaces is a company that has a technology to created a virtually federated database in the cloud. DBSpaces is a Virtual Database technology that allows an organisation thru a single Virtual Database access multiple data sources (or database spaces) in real-time. Additionally dbSpaces can be configured to access an organisations data internally using a remote gateway so that their dbSpace is seamless across the Public and Private cloud.

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