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• Why can't I get to a shared folder from Windows

  - by Ron

  I want to access a folder on my new Ubuntu 12.10 box from any machine on my network without the need to provide credentials. My machine name is Ubuntu1 I have a 2TB disk that formatted NTFS that has media on it The mount point is mount1 I have numerous folders on the disk and I want to share each of them individually I have enabled folder1 and folder2 for sharing I have enabled shared access, Allow others to create and delete files in this folder and guest access is allowed. The folder icon now has arrows so I assume all is good. From windows I can see under network Ubuntu1folder1 Ubuntu1folder2 When I click to open the folder from windows I get the error "You cannot access \Ubuntu1\folder1 You do not have permission to access \Ubuntu1\folder1 I have them both on the same workgroup. Your assistance would be appreciated

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• Big problem: Complete computer crash (no response when booted)

  - by Feratile

  I need your help: I installed Ubuntu 12.04 on my computer (I removed the complete system and installed Ubuntu instead) It said that the bootloader installation failed. So I chose the only partition that existed again. Installation succesful. Restart your computer. I did this. Then it went black when it rebooted (only a flickering stroke appears). No ISOs are executable. BIOS Boot Device Priority says: 1st Boot Device [SATA:PM-SAMSUNG HM] That was all I can say, please help me!

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• Ubuntu 13.10 and Dell Inspiron 7520 SE (Intel 4000 and ATI radeon HD 7730m)

  - by pjgowtham

  I installed 13.10 and i have problems with my display. Everything else works fine. I cant control my brightness. I thought the graphics driver is the problem. So i went to software updates, switched to another driver (proprietary) and the Ubuntu screen went black and i wasn't able to boot either. I cant use my lap with such low brightness. Then i reinstalled 13.10 again, This time full hdd reset. Same problem occurred. I grabbed radeon hd7730m for Linux x64 from the amd site, installed it, and the screen went black with only the "x" cursor showing on the next boot. What should i need to do to make my brightness work and stabilize graphic cards as mine is switchable graphics type.

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• How does "rm" on a NTFS filesystem differs from Window's own implementation?

  - by DavideRossi

  I have an external USB disk with an NTFS filesystem on it. If I remove a file from Windows and I run one of the several "undelete" utilities (say, TestDisk) I can easily recover the file (because "it's still there but it's marked as deleted"). If I remove the file from Linux no utility (unless I use a deep-search signature-based one) can recover the file. Why? How is unlink implemented in Linux's NTFS file system code? It looks like it does not just "mark it as undeleted" but it wipes away some on-disk structure, is this the case?

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• Sudo Non-Password access to /sys/power/state

  - by John

  On my computer, pm-hibernate appears to be broken, however using the command echo disk > /sys/power/state appears to work perfectly. Now I just need regular user access to it, using sudo. How do I do this? The command sudo echo disk > /sys/power/state simply returns bash: /sys/power/state: Permission denied. Also, I need this in a regularly used script, how can I make it so that I don't have to type in my password for it to work???

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• Why does my RAID configuration with mdadm fail on reboots?

  - by Andy B

  I have been running Ubuntu server on my machine for 2 years and it has worked ok. I would like to speed it up by raiding a few drives. The machine is used to host my Mysql databases internally. using MDADM raid.. I have tried 2 schemes so far with the 3 drives. 2 partitions on each drive 1 for the swap 1 for the O/S both of them turned into drives raid level 5 3 partitions on each drive 1 for the boot 1 for the swap and 1 for the root. The boot I set to raid level1 and the swap and root raid drives were set to level5 Both setup worked fine for about a week, then on a reboot things fall apart. by fall apart I mean I end up with a bunch of hard drive errors on the screen and then get a grub prompt. Why do they fail on reboots? I am eager to understand what I am doing wrong thanks!

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• Lubuntu from USB

  - by WGCman

  I have An Acer Aspire 1362 Laptop with AMD Sompron 2800+ processor and only 256MB RAM, with Windows XP installed. I have downloaded Lubuntu-12.04-alternate-i386.iso and installed it to a 16GB USB stick. I do not want to install Lubuntu on my hard drive (yet!). I have got the USB stick to boot, and am working my way through the menu. At one stage, the installer wants to partition my hard drive, so I abort the installation. There doesn't seem to be an option on the menu to boot and run Lubuntu from the USB stick without putting stuff on the hard drive. How can I achieve this, please?

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• Reasonable size for "filesystem reserved blocks" for non-OS disks?

  - by j-g-faustus

  When creating a file system ( mkfs ...) the file system reserves 5% of the space for its own use because, according to man tune2fs: Reserving some number of filesystem blocks for use by privileged processes is done to avoid filesystem fragmentation, and to allow system daemons, such as syslogd(8), to continue to function correctly after non-privileged processes are prevented from writing to the filesystem. But with large drives 5% is quite a lot of space. I have 4x1.5 TB drives for data storage (the OS runs on a separate disk), so the default setting would reserve 300 GB, which is an order of magnitude more than the the entire OS drive. The reserved space can be tweaked, but what is a reasonable size for a data disk? Can I set it to zero, or could that lead to issues with fragmentation?

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• After upgrade to xubuntu 12.10 I have 2 mount points for each partition

  - by TiGR

  Just upgraded Xubuntu 12.04 to 12.10 (both XFCE and LXDE desktops are being used at this system). Now I have 2 mount points for each partition. It looks like this: It appears this way in both Thunar and PCManFM. However, there are no dupes in Nautilus. $ ls /dev/disk/by-id/ ata-ST320410A_5FB3MA76 ata-ST3250620A_9RT030B0-part3 scsi-SATA_ST320410A_5FB3MA76-part1 scsi-SATA_ST3250620A_9RT030B0-part4 ata-ST320410A_5FB3MA76-part1 ata-ST3250620A_9RT030B0-part4 scsi-SATA_ST320410A_5FB3MA76-part2 scsi-SATA_ST3250620A_9RT030B0-part5 ata-ST320410A_5FB3MA76-part2 ata-ST3250620A_9RT030B0-part5 scsi-SATA_ST320410A_5FB3MA76-part3 scsi-SATA_ST3250620A_9RT030B0-part6 ata-ST320410A_5FB3MA76-part3 ata-ST3250620A_9RT030B0-part6 scsi-SATA_ST3250620A_9RT030B0 scsi-SATA_ST3250620A_9RT030B0-part7 ata-ST3250620A_9RT030B0 ata-ST3250620A_9RT030B0-part7 scsi-SATA_ST3250620A_9RT030B0-part1 scsi-SATA_ST3250620A_9RT030B0-part8 ata-ST3250620A_9RT030B0-part1 ata-ST3250620A_9RT030B0-part8 scsi-SATA_ST3250620A_9RT030B0-part2 ata-ST3250620A_9RT030B0-part2 scsi-SATA_ST320410A_5FB3MA76 scsi-SATA_ST3250620A_9RT030B0-part3 $ ls /dev/disk/by-uuid/ 01CD9E239FDF54F0 5299-430B 8824C9E324C9D3FA b05c582e-77df-4b83-8a75-17db1ab5dbc1 09a9cf9e-6af4-45ed-a9ac-782c764fe8d1 6bbd501e-7601-4ee7-b725-d3ec7f19f149 8B7C-BAF8 f54ee301-4bd4-40e3-a9fb-75ca79c05974 50366CC66E8BA293 8553dc4a-5d63-4078-9be3-ea91a46d8c67 a5be1bcd-b7c6-4273-8ade-eb9cce15504d There are no SCSI drives in this system. What could cause this problem? Is it a bug?

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• How are Reads Distributed in a Workload

  - by Bill Graziano

  People have uploaded nearly one millions rows of trace data to TraceTune.  That’s enough data to start to look at the results in aggregate.  The first thing I want to look at is logical reads.  This is the easiest metric to identify and fix. When you upload a trace, I rank each statement based on the total number of logical reads.  I also calculate each statement’s percentage of the total logical reads.  I do the same thing for CPU, duration and logical writes.  When you view a statement you can see all the details like this: This single statement consumed 61.4% of the total logical reads on the system while we were tracing it.  I also wanted to see the distribution of reads across statements.  That graph looks like this: On average, the highest ranked statement consumed just under 50% of the reads on the system.  When I tune a system, I’m usually starting in one of two modes: this “piece” is slow or the whole system is slow.  If a given piece (screen, report, query, etc.) is slow you can usually find the specific statements behind it and tune it.  You can make that individual piece faster but you may not affect the whole system. When you’re trying to speed up an entire server you need to identity those queries that are using the most disk resources in aggregate.  Fixing those will make them faster and it will leave more disk throughput for the rest of the queries. Here are some of the things I’ve learned querying this data: The highest ranked query averages just under 50% of the total reads on the system. The top 3 ranked queries average 73% of the total reads on the system. The top 10 ranked queries average 91% of the total reads on the system. Remember these are averages across all the traces that have been uploaded.  And I’m guessing that people mainly upload traces where there are performance problems so your mileage may vary. I also learned that slow queries aren’t the problem.  Before I wrote ClearTrace I used to identify queries by filtering on high logical reads using Profiler.  That picked out individual queries but those rarely ran often enough to put a large load on the system. If you look at the execution count by rank you’d see that the highest ranked queries also have the highest execution counts.  The graph would look very similar to the one above but flatter.  These queries don’t look that bad individually but run so often that they hog the disk capacity. The take away from all this is that you really should be tuning the top 10 queries if you want to make your system faster.  Tuning individually slow queries will help those specific queries but won’t have much impact on the system as a whole.

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• The Truth About Wi-Fi Signal Strength

  - by Jason Fitzpatrick

  Whether it’s the structural layout of your home or just ghosts in the machine, we’re all familiar with inexplicable Wi-Fi dead spots. One extra puzzling situation, unseen in the comic here, is when the addition of another wireless node actually causes issues with your Wi-Fi connectivity. There’s nothing more frustrating than having twice the Wi-Fi node power and half the actual signal at your laptop. If you’re looking to extend your Wi-Fi network coverage headache free, check out our guides to doing so with Tomato-powered routers and DD-WRT-powered routers. Your Wireless Internet Signal Strength [via FailDesk] How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode

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• installing ubuntu 10.04 over top 11.04

  - by Alex

  im looking to install 10.04 over top the 11.04 partition, it wouldnt let. keeps giving me a "root file system not found" error ever time i manually select partition. (i have a win7 partition) 11.04 popped up after upgrade that my hardware isnt supported for unity. and i cant boot into it, hangs up on purple screen right after boot menu. if anyone can post a link to a how to guide or put it on here, would be great? im trying to take advantage of my nvidia geforce gt 120m (its a laptop) to play around with cuda/c++ programming!

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• How to solve dual monitor issue, which happens only during X start?

  - by tamashumi

  When is loading and two monitors are connected, instead of a login screen I see this: ...after clicking OK, selection appears: Then I'm following to console login, disconnecting by hand the secondary monitor cable, restart lightdm with a command sudo service lightdm restart ...and voila! System loads fine. If I disconnect the cable before boot X will be loaded fine too. It's not a nice 'feature' when I have to disconnect the cable each boot or X restart. I was trying to delete monitors.xml but it didn't help. The situation relates to my notebook with Intel integrated GPU. The same happens on two different pairs of monitors: at the office and at home. How can I fix this? Ubuntu 12.04 x64 Desktop with default Unity GUI.

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• ubiquity "hangs" after hitting first "forward" button

  - by bumbling fool

  I've been trying to install Ubuntu but, no matter what I try (wifi connected, wifi not connected, disk blank, disk prepartitioned...), it just "hangs" at the first window (pick your language) with a non-stop hourglass after hitting "forward". This is on a Stinkpad T42. Shouldn't ubiquity at least tell me what's going on? I tried to find a log but /var/log/installer* isn't present. Initiating ubiquity from command line doesn't provide any debug info either. Even when using --debug or other combinations.

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• Cannot read from 2nd SATA data drive connected via SATA docking station

  - by Robbo

  Installed 10.10 this week on dual boot system. Everything else works fine but cannot read from 2nd SATA drive with all my data. Same drive works normally when booted to Windows XP. Interesting part is that I can see the drive in Ubuntu Disk Manager, can read all its attributes, can test it, shows up in Disk Manager, Storage Device Manager and Mount Manager, and can mount it, even change attributes; it appears healthy but does not show up in "Computer" or anywhere else that it can be accessed. The drive is connected via an external e-SATA docking station which is connected to a SATA port on the motherboard.

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• Clone a VirtualBox Machine

  I just installed VirtualBox, which I want to try out based on recommendations from peers for running a server from within my Windows 7 x64 OS.  Ive never used VirtualBox, so Im certainly no expert at it, but I did want to share my experience with it thus far.  Specifically, my intention is to create a couple of virtual machines.  One I intend to use as a build server, for which a virtual machine makes sense because I can easily move it around as needed if there are hardware issues (its worth noting my need for setting up a build server at the moment is a result of a disk failure on the old build server).  The other VM I want to set up will act as a proxy server for the issue tracking system were using at Code Project, Axosoft OnTime.  They have a Remote Server application for this purpose, and since the OnTime install is 300 miles away from my location, the Remote Server should speed up my use of the OnTime client by limiting the chattiness with the database (at least, thats the hope). So, I need two VMs, and Im lazy.  I dont want to have to install the OS and such twice.  No problem, it should be simple to clone a virtualbox machine, or clone a virtualbox hard drive, right?  Well unfortunately, if you look at the UI for VirtualBox, theres no such command.  Youre left wondering How do I clone a VirtualBox machine? or the slightly related How do I clone a VirtualBox hard drive? If youve used VirtualPC, then you know that its actually pretty easy to copy and move around those VMs.  Not quite so easy with VirtualBox.  Finding the files is easy, theyre located in your user folder within the .VirtualBox folder (possibly within a HardDisks folder).  The disks have a .vdi extension and will be pretty large if youve installed anything.  The one shown here has just Windows Server 2008 R2 installed on it nothing else. If you copy the .vdi file and rename it, you can use the Virtual Media Manager to view it and you can create a new machine and choose the new drive to attach to.  Unfortunately, if you simply make a copy of the drive, this wont work and youll get an error that says something to the effect of: Cannot register the hard disk PATH with UUID {id goes here} because a hard disk PATH2 with UUID {same id goes here} already exists in the media registry (PATH to XML file). There are command line tools you can use to do this in a way that avoids this error.  Specifically, the c:\Program File\Sun\VirtualBox\VBoxManage.exe program is used for all command line access to VirtualBox, and to copy a virtual disk (.vdi file) you would call something like this: VBoxManage clonehd Disk1.vdi Disk1_Copy.vdi However, in my case this didnt work.  I got basically the same error I showed above, along with some debug information for line 628 of VBoxManageDisk.cpp.  As my main task was not to debug the C++ code used to write VirtualBox, I continued looking for a simple way to clone a virtual drive.  I found it in this blog post. The Secret setvdiuuid Command VBoxManage has a whole bunch of commands you can use with it just pass it /? to see the list.  However, it also has a special command called internalcommands that opens up access to even more commands.  The one thats interesting for us here is the setvdiuuid command.  By calling this command and passing in the file path to your vdi file, it will reset the UUID to a new (random, apparently) UUID.  This then allows the virtual media manager to cope with the file, and lets you set up new machines that reference the newly UUIDd virtual drive.  The full command line would be: VBoxManage internalcommands setvdiuuid MyCopy.vdi The following screenshot shows the error when trying clonehd as well as the successful use of setvdiuuid. Summary Now that I can clone machines easily, its a simple matter to set up base builds of any OS I might need, and then fork from there as needed.  Hopefully the GUI for VirtualBox will be improved to include better support for copying machines/disks, as this is Im sure a very common scenario. 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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• How to use unused space in ubuntu

  - by Ravi.Kumar

  I installed ubuntu on my machine with only 80 GB of memory anticipating that I will remove it later but now I want to keep it forever (until I am frustrated with linux). I have 500 GB in my machine and now I want to use that raw 420 GB of space. How I can I do that ? with "space/memory" I am referring to secondary memory not Ram. Here is output of : sudo fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000dcb77 Device Boot Start End Blocks Id System /dev/sda1 * 2048 136718335 68358144 83 Linux

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• Installing Ubuntu, Switches of to intergrated Graphic Card

  - by Clenn

  I got a problem. I'm willing to dual boot ubuntu 12.04 on my desktop. After i made a bootable USB ubuntu on it i'm going to install it. I boot it and I choose Install ubuntu roughly said. The problem is the following, It seems that when i press enter to start the install he switches of to my intergrated graphic card. I looked up in my bios what my primary graphic card selection is and it was on PCI Express (the option it supossed to be). So I'm clueless right now. I don't know how to fix this because I'm quite learning linux atm (school and by myself). Your faithfully, Clenn

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• How to enlarge ubuntu partition

  - by Vineet

  I installed Ubuntu 11.10 recently by making a 5.6GB partition from the Ubiquity installer. I wanted to upgrade to 12.04, so I opened the Update Manager and clicked on 'Update Packages' (I was following this guide) After clicking, it said that there was too little space available. So, I want to enlarge my Ubuntu partition so that there is appropriate space for upgrading. I downloaded Gparted. I read another guide which said my computer won't boot if I resize the Ubuntu partition because '/boot will be misplaced and I will have to repair GRUB2 myself.' So how do I do this easily? Thank you in advance.

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• Activate swap by default

  - by San

  I installed Ubuntu 11.04 Natty and I set a partition for swap about 900 MB. Afterthat, I installed Kubuntu 12.10 Quantal, repartitioned my hard disk so I had 2048 MB swap (replaced 900 MB swap partition). I ran Kubuntu, and it's ok. But after I ran Ubuntu 11.04 Natty, It didn't use that swap. But I can activate it with Gparted. Some additional information. When I installed Kubuntu Quantal. I make 256 MB partition (ext4 mount point in /boot) which replaced previous 256 MB partition (ext4 mount point in /boot) that I created when I installed Natty. Something wrong with my configuration?.

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• How to modify grub entry for supporting KGDB kernel image?

  - by Nishant

  I am trying to update target m/c grub.cfg file for KGDB setup but while booting the m/c it got hung completely and not asking/waiting for remote gdb connection. Following is the entry which I added:- menuentry 'Ubuntu, with Linux 2.6.32-24-kgdb' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 12878c3b-c553-4b4b-986a-6e32daea3ad1 linux /vmlinuz-2.6.32-kgdb root=/dev/mapper/ubuntu-root ro kgdbwait [email protected]/,@192.168.140.158/ quiet initrd /initrd.img-2.6.32-24-server } I have also compiled and copied /boot/vmlinuz-2.6.15.5-kgdb & /boot/System.map-2.6.15.5-kgdb to target m/c from devlopement m/c. STD entry before adding KGDB in grub.cfg was:- menuentry 'Ubuntu, with Linux 2.6.32-24-server' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 12878c3b-c553-4b4b-986a-6e32daea3ad1 linux /vmlinuz-2.6.32-24-server root=/dev/mapper/ubuntu-root ro quiet initrd /initrd.img-2.6.32-24-server } Please suggest how to get rid of this problem.

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• How to restart WiFi interface without rebooting (it drops connection)?

  - by Dima

  I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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• I'm trying to install Bruteforce Savedata from the archiver

  - by Jonathan

  I've just installed UBUNTU 12.04 for curiosity purposes. I'm a gamer and I wanted to install Brute force Save data on my comp. So i download it and it open in the Archive manager i go to run the ".exe" but encounter this message Archive: /home/c4/Desktop/Bruteforce_Save_Data_installer.exe [/home/c4/Desktop/Bruteforce_Save_Data_installer.exe] End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. zipinfo: cannot find zipfile directory in one of /home/c4/Desktop/Bruteforce_Save_Data_installer.exe or /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.zip, and cannot find /home/c4/Desktop/Bruteforce_Save_Data_installer.exe.ZIP, period. Please help!

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• Can't mount external hard drive

  - by tezza

  i have a problem accessing the data on my external hard drive. I recently did a fresh install but mistakenly left my external hard drive plugged in. When I tried to access the data on the external HDD, it says "no files" but recognizes that there is 290 GiB of data on it. The HDD is 350GB big. I checked the drive with Disk Utility and it showed that the hard drive had a bootable flag. So, in the edit partition, I unchecked this bootablity. Now it won't mount in Ubuntu and now my XP can't recognize it at all, whereas I could access the data on the XP machine before. In disk utility, it doesn't give me the option to check the bootable box in again and I can't access the data on XP either. Any ideas on how to fix it?

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• How to change the default desktop environment?

  - by Kshitiz Sharma

  I wanted to try out different desktop environments so I installed XFCE, KDE, GNOME, etc on top of Unity in Ubuntu 12.04 After a while I decided that I didn't like those other DEs and would stick to Unity. So I changed my default DE to Unity by configuring gdm. > sudo dpkg-reconfigure gdm Now I am able to choose my DE at login time and all of DEs are working properly. But the strange thing is that my boot up screen says 'lubuntu', my login screen is KDE, and my desktop is Unity. How and why is this happening? Why didn't my gdm configuration have any effect? Does login and boot up screen need to be configured separately from the DE? There are other similar questions here but they are not the same as this one. I do not want to remove the other enviroments I'm quite happy with having a list of DEs to select from. I want to know how to set proper defaults.

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