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• Installing along side of Windows 8

  - by Jake

  It appears as though many people are having problems installing Ubuntu along side Windows 8. My problem, however, seems to be sufficiently different to be unique among such problems. I can't get the Ubuntu 12.10 live-USB installer to run. When I boot I get the following four options: Run from this USB Install to disk Check memory (I can't remember the last one) I have tried the top two. Both result in the screen going black briefly then windows 8 booting as per usual. Does anyone know how I may manage to overcome this problem?

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• G5 quad core will not boot from Ubuntu CD

  - by Steve Howard

  I have a PPC G5 Quad Core with Leopard on one hard drive and I want to install Ubuntu on a second hard drive. The second drive is installed and formatted as a Mac OS Extended (Journaled) drive. I have had no success booting from a CD or DVD with various PPC versions of Ubuntu using any of the suggested keys such as "C, Option, or anything else. Booting into open firmware doesn't work as the system can't find the \install\yaboot file. I am using various CD's burned as iso disk images, but none will boot. I have reset the PRAM, etc, to no avail. Beginning to get very frustrated. Can someone shed some light and provide me with a command line in open firmware that will work, or else direct me to a confirmed PPC bootable version of Ubuntu please? I'd appreciate any help you can provide....

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• Trying to get back seamless mode on my VirtualBox

  - by Newben

  I am trying from some days to activate again the seamless mode on my VirtualBox(using Ubuntu 12.04 on an osx device), which was correctly set till now but which isn't working anymore. I have had already this problem but then I had to reinstall a new disk on my VB. I tried everything I know : installing it by clicking on the 'devices' item in the nav bar of VB's app, I created a new dir in /media and then tried to mount the /dev/sr0. When running sh ./VBoxLinuxAdditions.run, it installed correctly But when rebooting my machine, I always have the same problem. Does anybody knows how to activate again Seamless Mode ?

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• Can't access my partitions after installing Ubuntu

  - by Manaf Al-Sarraf

  I installed Ubuntu 13.4 replace with win 8 after installation complete I can't access my partitions and receive a message like this : Error mounting /dev/sda5 at /media/manaf/01CD6C0800CEE670: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda5" "/media/manaf/01CD6C0800CEE670"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sda5': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option." Thanks for helping :)

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• apt-get not recognizing downloaded archives

  - by meteors

  I installed Ubuntu Gnome 13.10. I previously had Ubuntu Gnome 13.04 and had all the archives in the /var/cache/apt/archives/ stored to a removable disk. After installing 13.10 I copied all my archives to the above mentioned path. When I run apt-get install it tries to fetch the archives although I have the archives. Also if instead of apt-get install if I try to install individual .deb files using dpkg -i everything runs fine. These are the permissions of files: How do I fix this. Previously copying archives like this worked fine and downloading duplicates the files.

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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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• Unit testing a text index

  - by jplot

  Consider a text index such as a suffix tree or a suffix array supporting Count queries (number of occurrences of a pattern) and Locate queries (the positions of all the occurrences of a pattern) over a given text. How would you go about unit testing such a class ? What I have in mind is to generate a big random string then extract a random substring from this big string and compare the results of both queries with naive implementations (such as string::find). Another idea I have is to find the most frequent substring of length l appearing in the original string (using perhaps a naive method) and use these substrings for testing the index. This isn't the best way, so what would be a good design of the unit tests for a text index ? In case it matters, this is in C++ using google test.

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• Trouble installing 12.04 from cd, blank screen with cursor

  - by Master Morality

  I should preface this with saying that this is not my first rodeo. I started playing with Linux in 1999 (Red Hat) and I'm currently typing this on a ThinkPad running 12.04... When I put in the live cd, I boots, and I can get to the option menu to decide whether to install/run etc, but at any point beyond that I get only a single caret. I can type stuff in, but it goes no where. I've tried the usual stuff like running with nomodeset (thinking it was the intel HD400 graphics, but it is integrated graphics...) here is the setup: ASUS p8z77 pro (with the Atheros AR9485 wifi supposedly, but I'm not that far yet) i7 3370k 8gig X 2 G.Skill Crucial M4 (256 gig) LG Super-multi DVD re-writer no video card UPDATE: I though may be it was a bad image on the CD, so I downloaded another iso, and used a USB disk. now it boots to a blank screen. I can see the "press any key to get options" screen, but after that, it just goes to a blank screen.

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• HELP: I Broke Ubuntu By Uninstalling Compiz

  - by tSquirrel

  I'm still getting used to Linux, having come from Windows. I was receiving an error that "compiz" had crashed a few times so I figured I'd uninstall it. sudo apt-get remove compiz sudo apt-get install compiz I logged out then back in, after that, the GUI was totally gone and I have no idea how to get it back or what I need to do to restore the GUI to what it was before I killed poor Compiz. GUI was pretty much unmodified after a fresh install of 14.04 How can I fix it? I'm not even sure how to get to a terminal or anything. The login screen looks normal, but after logging in, it's a totally bare desktop with my backround and a few icons. No Dash, toolbar, etc. Hot Keys don't seem to work either (Super = Dash doesn't work, etc); although I did accidently open "Disk" UI. Not sure how. Please Help! Right now I'm working off my W7 dualboot.

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• Construct an array from an existing array

  - by Luv

  Given an array of integers A[1...n-1] where 'N' is the length of array A[ ]. Construct an array B such that B[i] = min(A[i], A[i+1], ..., A[i+K-1]), where K will be given. Array B will have N-K+1 elements. We can solve the problem using min-heaps Construct min-heap for k elements - O(k) For every next element delete the first element and insert the new element and heapify Hence Worst Case Time - O( (n-k+1)*k ) + O(k) Space - O(k) Can we do it better?

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• Ubuntu 13.04 is showing some error while opening my computer

  - by Singh

  Few months before when I was using Ubuntu 12.04 then I found some errors while starting my computer. Due to this problem I had given my CPU to a shop to repair it I don't know what he has done to my CPU but I only know that finally I got my CPU with Ubuntu 13.04. The technician was unable to make any partition and I also think that he had installed 13.04 over 12.04 and so now my computer is showing some error when I'm starting my computer the error is as follows: error: attempt to read or write outside of the disk 'hd0'. grub rescue _ Before showing this error, few times my computer was working very slow. So kindly someone tell me that is there any way by which I can start my computer. Please also tell me that what things I have to keep in mind while using Ubuntu so that in future I find no difficulties(errors) while using Ubuntu.

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• How do I best remove an entity from my game loop when it is dead?

  - by Iain

  Ok so I have a big list of all my entities which I loop through and update. In AS3 I can store this as an Array (dynamic length, untyped), a Vector (typed) or a linked list (not native). At the moment I'm using Array but I plan to change to Vector or linked list if it is faster. Anyway, my question, when an Entity is destroyed, how should I remove it from the list? I could null its position, splice it out or just set a flag on it to say "skip over me, I'm dead." I'm pooling my entities, so an Entity that is dead is quite likely to be alive again at some point. For each type of collection what is my best strategy, and which combination of collection type and removal method will work best?

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• grub2 update-grub puts wrong UUID in grub.cfg for system with separate /, /boot and /home partitions

  - by keepitsimpleengineer

  It is putting in the UUID for the boot partition and not the / (root) partition. It's grub2 (1.99-21ubuntu3.1) on Xubuntu 12.04. UPDATE: ? I ran Boot Info Script 0.60, here are results? The boot info script is too big for askubuntu, but is here. The system not booting is on /dev/sdh. The booted disk, Xubuntu 12.04, is /dev/sdb. /sdh2/etc/fstab is at line 1073. The incorrect UUIDs are at line 945 and 954. "blkid" putput is at line 318. It is putting the UUID for "boot" versus "root" in boot.cfg, line 937. I have noticed that the relationship between physical drives and names in /dev vary depending on which system is booted.

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• Ubuntu 11.04 windows XP dual boot problem

  - by Bernie

  I have installed Ubuntu 11.04 direct from installation disk in a separate partition alongside an existing Windows XP installation. Ubuntu operates fine. I can see the old XP file system and the other network computer and access the internet. The problem is when the computer starts I get the boot selection list for Ubuntu or XP; but I am not allowed to select Windows XP (I cannot scroll down the list with tab or arrows keys). This would be fine for me but the computer is used by other people who are only familiar with windows XP at the moment. I have downloaded and run Boot Repair. Below is the link to the resulting data. http://paste.ubuntu.com/1082944/ I hope you can help solve this problem. I look forward to hearing from you. Kind Regards Bernie.

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• How to completely turn off session saving?

  - by Thorn

  Hi all, I opened System > Preferences > Startup Application > Options and clicked on Remember currently running Applications. I suppose this makes Ubuntu memorize (save a list on some place in disk) all currently running applications and when you reboot your computer, the OS starts with everything in that list. Now I want to get rid of it. Of course I can close all applications which I do not want to start in startup, and click Remember currently running Applications again, but this doesn't seem to work as expected. For example, Yakuake opens differently if I do that. What I want is to completely turn off session saving. Maybe I can delete the stored information somehow?

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• The DotNetNuke Gallery Module - 7 Video Tutorials

  In this video tutorial we cover the Installation of the DotNetNuke Core Gallery Module and show you how to configure it correctly.We walk you through how to use all of the features in the Gallery module including creating albums, uploading files, bulk uploads, the slideshow, media files, watermarks, templates, and more.The videos contain:Video 1 - Introduction to the DNNGallery Module, Installation and Basic ConfigurationVideo 2 -How to Upload Images and Configure Their SettingsVideo 3 -Creating Gallery Albums and Bulk UploadingVideo 4 - How to Add Files and Albums Using FTP, Adding Music and Changing Permissible Upload TypesVideo 5 - How to Add Video Files, How to Rate Files,Gallery Look and FeelVideo 6 - Changing Feature Settings,Adding Watermarks, Gallery Security RolesVideo 7 - Working withPrivate Galleries and Security Roles, Gallery MaintenanceTotal Time Length: 57minsThe DotNetNuke Gallery Module - 7 Video Tutorials Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• T-SQL Tuesday: What kind of Bookmark are you using?

  - by Kalen Delaney

  I’m glad there is no minimum length requirement for T-SQL Tuesday blog posts , because this one will be short. I was in the classroom for almost 11 hours today, and I need to be back tomorrow morning at 7:30. Way long ago, back in SQL 2000 (or was it earlier?) when a query indicated that SQL Server was going to use a nonclustered index to get row pointers, and then look up those rows in the underlying table, the plan just had a very linear look to it. The operator that indicated going from the nonclustered...(read more)

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• Lost /boot partition

  - by s3v3n

  Recently I installed Windows XP on my machine where I had only Ubuntu. The problem is that I had my /boot on a separate, 200 Mb partition at beginning of the hard-disk (the leftmost). Installing windows, it said that it can't write MBR because there's an unknown partition, so I formatted that partition as NTFS, and I could finally get windows installed. Now I want to restore that partition so I can use my Linux keeping both systems. Now should I install grub2 there, or it's OK by restoring partition data? If the first is the correct answer then provide me a little tutorial on installing it. Keep in mind that there was my /boot folder.

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• Swap File, Mount point, GRUB2

  - by Mike Green

  Windows 7 with 1gb RAM Hi. I am installing Ubuntu 12 onto a 20gb ext3 partition. I have 100gb free disk space. The install asked me to choose a swap space. Do I have to allocate another partition for the swap space, and if so, what size should it be? I installed without allocating a swap space. Can I allocate a swap space after the install? The install asked me for a mount point. I chose /. Is this okay? I also want to ensure that GRUB2 will be installed within the UBUNTU partition. Is there an option for this on the install? (I will use EasyBCD to select Windows7 or UBUNTU.) Thanks for your help, M...

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• Handy Javascript array Extensions &ndash; contains(&hellip;)

  - by Liam McLennan

  This javascript adds a method to javascript arrays that returns a boolean indicating if the supplied object is an element of the array Array.prototype.contains = function(item) { for (var i = 0; i < this.length; i += 1) { if (this[i] === item) { return true; } } return false; }; To test alert([1,1,1,2,2,22,3,4,5,6,7,5,4].contains(2)); // true alert([1,1,1,2,2,22,3,4,5,6,7,5,4].contains(99)); // false

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• My laptop shuts down when I remove the charger

  - by Hakim0

  Laptop shuts down when charger is removed. As well I get a message when booting up saying disk drive for /media/3936-3939 is not ready or not present. About a week ago I was trying to install a matlab iso file using mount commands etc... I tried mount, fuseiso, and UNETbootin. I have a feeling this may have something to do with message I'm getting from booting up. If anyone can point me in the right direction or help me out. Many thanks.

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• /etc/crypttab not working

  - by Jeremy Stein

  I used the Disk Utility to create an encrypted volume on an external drive. When I click the Unlock Volume button in that program, it mounts the drive for me. Now, I want to automate this process so that it will happen at boot-up. When I run sudo cryptsetup luksUUID /dev/sdb1, I get this: ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 So, I create /etc/crypttab like this: backup_drive UUID=ca709269-1e3e-4e9e-9e08-7248f0e6c5a6 none And I added this line to /etc/fstab: /dev/mapper/backup_drive /mnt/backup ext3 default 0 2 When I reboot, Ubuntu tells me that the device is not available to map, so I tell it to skip it. It appears that the /etc/crypttab is not getting run correctly. How can I debug this?

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• Better way to search for text in two columns

  - by David

  Here is the scenario. I am making a custom blogging software for my site. I am implementing a search feature. It's not very sophisticated - basically it just takes the search phrase entered and runs this query: $query="SELECT * FROM `blog` WHERE `title` LIKE '%$q%' OR `post` LIKE '%$q%'"; Which is meant to simply search the title and post body for the phrase entered. Is there a better way to do that, keeping in mind how long it would take to run the query on up to 100 rows, each with a post length of up to 1500 characters? I have considered using a LIMIT statement to (sometimes) restrict the number of rows that the query would examine. Good idea?

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• Ubuntu won't stay installed

  - by tommythm227

  I recently experienced OS problems with Windows 8 so I decided to wipe my hard drive and install Ubuntu using a usb boot. I am able to "Try Ubuntu" or choose to install instantly, however, after installation it asks me to restart my computer but when I do this I receive the same installation options I originally had, "Try Ubuntu", "Install", "OEM Install", "Repair Disk". I initially thought this was the result of leaving the boot usb in, so I tried reinstalling, but now I just receive a message saying "No boot disc or boot disc failed". This happens with any type of install I do, I've tried clearing the hard drive multiple times, making a new boot usb, but nothing seems to help. I've tried reinstalling windows, but I encounter the same problem, without the usb I get an error. I have an Acer Aspire M3470, I cleared my hard drive and attempting to install via usb boot. I have a weird BIOS menu probably because of AMD but it's been hard to find information regarding my particular BIOS menu. HERE is an image of my BIOS menu

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• default mount point changed for external HD

  - by JhmL

  The default mount point for my external HD changed when upgrading from 13.04 to 13.10. Now the username is added as an extra level before the hd label. So it used to be /media/nameofhd and now it became /media/username/nameofhd This breaks a lot of links I have set up to this disk. I know that I can mount it manually and even automatically through /etc/fstab. What I want to know is why this behaviour changed and how I can change it back to the original? blkid and fdisk don't show anything suspicious. thx!

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