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• Change desktop background at school

  - by Nano8Blazex

  On school computers, I can log in with a user account stored on the school network (something like that, I have no experience in networking and this sort of stuff). Everything is fine and dandy and totally works as it should, but there is one thing that I find annoying. Apparently for some reason I can't change my background to anything more than a couple of different solid colors with our school's logo still stuck in the middle. (the original background is a white logo on black background. If I change it to a different color, the central 6x6 inch black/white logo still remains, only the surrounding color is changed.) It may have been set by school administrators or something, I don't really know. I find this really ugly. Is there any way to change a setting so that I can set the background to any picture I wish? (like on a home pc...) Thanks.

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• Converting legacy GRUB menu entries to GRUB 2

  - by WindowsEscapist

  I would like to change an entry for a solution to boot from CD from legacy grub (looks like title bla bla bla) to an entry to a format compatible to grub 2 (the one that looks like menuentry "bla bla bla" {. The original legacy GRUB entry is as follows: title Boot From CD/DVD Drive kernel /boot/grub/memdisk.din initrd /boot/grub/sbootmgr.dsk Is there any sort of conversion rule to change this to something like the example I've put here on the next line? (This is from my precise's grub.cfg.) menuentry 'Ubuntu, with Linux 3.2.0-25-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail gfxmode $linux_gfx_mode insmod gzio insmod part_msdos insmod ext2 set root='(hd0,msdos8)' search --no-floppy --fs-uuid --set=root efc87ac0-daac-4a32-9a85-ea57beff0e28 linux /boot/vmlinuz-3.2.0-25-generic root=UUID=efc87ac0-daac-4a32-9a85-ea57beff0e28 ro quiet splash acpi_osi= $vt_handoff initrd /boot/initrd.img-3.2.0-25-generic }

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• Using optimization to assign by preference

  - by Aarthi

  I have 100 objects ("candies") that I need to distribute between five people so that each has an equal number of candies (in this case, 20 candies per person). However, each person has also expressed their preferences of candy to me in a chart, similar to below. Top-favored candies receive 10 points, least-favored candies receive -10 points, and neutral-favored candies receive 0.5 points. I need to sort the items out so that: Each person receives the same number of candies Each person's total "satisfaction" (points) is maximized My output is a list of each person's assigned items I'm familiar with Excel's in-house Monte Carlo simulation tools (Solver, F9 diceroll, etc) and would like to stick to those tools. While I know how to set up the chart, and how to use the column summation to input into Solver, I don't know how to get it to give me the desired output. Furthermore, how do I adjust the solver so it takes into account individual preferences rather than empirical ones? To wit: how do I begin setting up this model?

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• "custom" routers for VPN - useful or waste of money?

  - by Andrew Heath

  I use VPN in China and my current service contract expires soon so I was checking what sort of plans are out there now. I found that Witopia offers a "Cloak Box", what appears to be a Linksys wireless router with allegedly hacked/custom firmware to support VPN. Aside from allowing multiple computers to share one VPN connection, is there anything else at work here to justify that price when most new routers are $100 or less these days? Or is this something targeted towards the cd-rom cupholder crowd? And yes, I've contacted them, but haven't heard back yet... EDIT I've heard back from the company - here are the details if anyone else is interested: the router is a Linksys WRT54GL running TomatoVPN custom firmware the hardware waranty is one (1) year, from Linksys/Cisco the VPN is hard-set, so any device connected to the router MUST use the VPN (Witopia blocks torrents) I've decided it's not for me, but hopefully this information will prove useful to others.

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• Why can't I copy files from a mac to a samba share?

  - by chris

  I have a share set up on my ubuntu 10.04 box, and the mac can see it, connect to it, and sort of write to it. When I try to copy a whole tree to the share, I get an error saying "The operation cannot be completed because you don't have access to some of the items". If I zip the directory, and copy that over, it succeeds. Any explanation? My smb.conf: [global] workgroup = wg netbios name = ubuntu security = user [Wife Debris] path = /home/wife/wifedebris read only = no guest ok = no force user = wife force group = wife

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• Vlookup to retrieve an ID from table using text match

  - by Federico Giust

  I've got an excel spreadsheet where I would normally use a VLOOKUP. In this case I need to find the ID of the record when comparing email addresses, so the email address is the unique id here. For example on sheet 1 A B C D Person Id | Family Name | First Name | Email #N/A | Doe | John | [email protected] On Sheet 2 A B C D Person Id | Family Name | First Name | Email 12345 | Doe | John | [email protected] Basically on sheet 1 I've got 800 records, on sheet 2 450. I know the 450 are in Sheet 1, so I need to find the ids of those, and put them on sheet 1 where I've got lots more data for each person. What I've tried so far is a VLOOKUP, but I keep getting an error. I'd like to do it with some sort of formula and not using any copy paste and remove duplicates. Any ideas?

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• Training Exchange junk filter via OS X Mail.app

  - by Doug Harris

  My company uses Exchange 2007 for our mail server (via 3rd party hosted service), I use OS X Mail.app on my MacBook Pro. When viewing my junk folder in the webmail interface, there's a "Not Junk" button which will move the email out of the Junk folder. I can mimic the basic functionality in Mail.app by dragging the message from the junk folder to another folder. But... does this train the server? Specific questions: Does pressing the "Not Junk" button in the webmail interface (or Outlook) do anything more on the server side? Does Exchange used any sort of statistical spam filtering (e.g. bayesian filtering) based on this action? If the answer to #1 is yes, does moving the folder out of the junk folder in Mail.app trigger the statistical learning? If the answer to #2 is no, is there a different way to trigger the learning?

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• How can I set the fan speed to 100% on a laptop?

  - by Codemonkey

  I recently purchased a HP Pavilion dv7-4031. When it's cool, it works smoothly and efficiently. However when CPU and GUP temperatures reach 60c and above, the PC starts freezing up and stuttering. I can hear that the fan speeds steadily increase all the way up to 70-80c. This is what pisses me off: I want the fan speeds to run 100% all the time, perhaps preventing the high temperatures in the first place. The way it is now, fan speeds only increase to keep internal temperatures at above 60c. I've searched all over for any sort of speed control, finding nothing. Any help appreciated. I have tried Speedfan. In "Fans" there is nothing listed. I took that as a bad sign. The BIOS is pathetic, and only has 4 or 5 changeable settings, including "Quickstart" and "Boot order"

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• Have you ever used kon-boot?

  - by Ctrl Alt D-1337

  Has anyone here ever used kon-boot? I guess it may work because of the few blog posts about it but I feel kinda concerned and am interested at hearing experiences from anyone who have used multiple times with no side effects. I am slightly worried for any direct memory altering it tries to do. I am also worried if this will do its job fine to hide the fact it puts in a low level trojan or if the author planned to do anything like that in a future release as it looks like closed source from the site. Also I don't intend to gain illegal access but I find these sort of things very useful for my box of live discs I take every where, just in case. OT: Other question that me be of interest to readers here

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• Hardware upgrade: Windows 7 bluescreens, Vista loads

  - by Daniel Schaffer

  I just did a fairly significant hardware upgrade while keeping my hard disks. The old system was a dell Optiplex 745 with an Intel Core 2 duo, LGA 775. The new system is custom built, Intel i5 750. I know you're supposed to do a clean install with a hardware upgrade like this, but I'd had success in the past doing the stealth hardware upgrade like this, so I figured I'd give it a shot. Windows 7 Ultimate 64 bit gets through the loading screen and immediately blue screens and reboots. Windows Vista Home Premium 32-bit, which I have on an old hard drive from an AMD box (!!) loads up fine. I ran through the windows memory checker just to be sure, and my memory is fine. So, is the BSOD the result of some sort of protection mechanism specific to Windows 7? Is there any hope of salvaging that install?

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• VMWare esxi 4.1 storage errors with MD3200

  - by Karl Katzke

  We're seeing some storage errors from the esxi logs relating to our MD3200. I'm sort of a VMWare noob and am not sure where to go from here because I couldn't find a lot of documentation on the VMWare website, and the forums didn't seem to have any posts about it with actual answers. Everything is working, but I'm trying to proactively troubleshoot this. sfcb-vmware_base|StoragePool Cannot get logical disk data from controller 0 sfcb-vmware_base|Volume Cannot get logical disk data from controller 0 sfcb-vmware_base|storelib-GetLDList-ProcessLibCommandCall failed; rval = 0x800E The ESXi boxes are connected directly via SAS to the controller on the MD3200. What do these errors actually mean, and what's a good path to start troubleshooting or solving them?

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• Preparing Automatic Repair appears out of nowhere & takes forever?

  - by Jörg B.

  I shutdown my work machine (Windows 8.1 Pro) without any errors appearing (and without installing any new software and especially no new drivers the last couple days) yesterday evening, turned it on this morning and it automatically started into 'Preparing Automatic Repair' mode. 1st of - is there any way to get more information WHY this is appearing out of the blue and.. 2ndly, how long is this usually supposed to take? This is a rather beefy machine (Intel 3770k / 4 core 3.9ghz, Intel SSDs only and 32 gb of ram) but this screen has been 'loading' for almost 1.5 hours now. Is there any sort of debug/verbose mode that would give me ANY indication what's going on?

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• AMD Phenom II X4 965 crossfire motherboard

  - by Nick

  I am trying to build a cheap mining rig. I wanted to use the AMD Phenom II X4 965 (HDZ965FBGMBOX) processor as it got very good reviews and benchmarks, and is inexpensive. However, I am having trouble finding motherboards with crossfire support for 2 GPUs. AMD's website only lists five compatible motherboards, of which only one has crossfire support. Worse, it is expensive and seems to be obsolete and no longer available. I have trouble believing that there are only five compatible motherboards for that CPU. Are there any low-end motherboards that are both compatible with the AMD Phenom II X4 965 and have CrossFire support? (Is there a way to find this sort of information, like a central site that lists motherboards and their technical specifications?)

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• Powershell BitLocker Recovery Key

  - by TheNoobofNoobs

  I'm trying to get a list of all computers that have a bit locker recovery key (or information for that matter) populated in their respective fields in AD. I am unable to even start on a script as I don't know where to begin. I did find this online but it doesn't appear to be working. foreach($comp in get-adcomputer -filter *) { get-adobject -filter 'objectclass -eq "msFVE-RecoveryInformation"' - searchbase $comp.distinguishedname -properties msfve-recoverypassword,whencreated | sort whencreated | select msfve-recoverypassword -last 1 } Export-Csv "FilePath.csv" Any ideas as to how I can go about this. Running Windows 7, Powershell 3.0, Windows Server 2008 R2.

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• sniffing on a switched LAN

  - by shodanex

  Hi, I often find myself in the position of having to sniff on a connection between for example an arm board I am developing on, and another computer on the network, or out of the network. The easy situation is when I can install a sniffer on the computer talking to the embedded device. When it is not possible, I currently install an old 10Mb/s HUB. However I am afraid my HUB might stop working, and I would like to know some alternative. Here are the alternatives I could think of : Buy another HUB. Is that still possible ? Have some sort of ethernet sniffing bridge, like what they do for USB. I am afraid this kind of device is expensive. use ARP poisoning.

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• My internet connection just got really slow - How can I troubleshoot it?

  - by Walden

  A few days ago my connection became really slow. I have DSL which should be 3mb down and 768k up. I'm lucky if I get 768k down and 200k up. It sucks. I called my ISP, Verizon and they did some sort of line test and told me the problem was on my end. I rebooted my modem several times, like they told me. I'm not really sure why I even bothered calling them, the guy on the other end was just reading stuff out of a notebook - pretty useless. So, I checked my network traffic in windows resource monitor, and there doesn't seem to be anything there hogging the bandwidth. What else could be slowing my connection down on my PC? on my router? Something else?

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• How can I diff two Redhat Linux servers?

  - by Stuart Woodward

  I have two servers that have should have the same setup except for known differences. By running: find / \( -path /proc -o -path /sys -o -path /dev \) -prune -o -print | sort > allfiles.txt I can find a list of all the files on one server and compare it against the list of files on the the other server. This will show me the differences in the names of the files that reside on the servers. What I really want to do is run a checksum on all the files on both of the servers and compare them to also find where the contents are different. e.g find / \( -path /proc -o -path /sys -o -path /dev \) -prune -o -print | xargs /usr/bin/sha1sum Is this a sensible way to do this? I was thinking that rysnc already has most of this functionality but can it be used to provide the list of differences?

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• Applying the Windows Experience Index to Servers

  - by Scott

  I finally convinced upper management that we need a computer replacement plan, and I've been tasked with making an inventory of what we have and determining what needs to be replaced this year, next year, the year after, etc. I had to use some sort of criteria to back up my recommendations, so I decided to try using the Windows Experience Index. I've determined the CPU and Memory scores for all of our desktops and servers using community data. I also feel fairly successful in assigning a WEI score to each user based on their computing needs. I'm struggling with assigning a WEI score to the various servers that we have: file server, database server, Exchange server, backup server (for doing backups), web server. Suggestions would be appreciated.

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• Pgpool-regclass gives error when installling

  - by user119720

  I have a problem when installing the pgpool-regclass. When I'm running 'Make',it shows me this kind of error : p,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -I/usr/include/et -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fpic -I. -I. -I/usr/pgsql-9.2/include/server -I/usr/pgsql-9.2/include/internal -I/usr/include/et -D_GNU_SOURCE -I/usr/include/libxml2 -I/usr/include -c -o pgpool-regclass.o pgpool-regclass.c pgpool-regclass.c:99:37: error: macro "RangeVarGetRelid" requires 3 arguments, but only 2 given pgpool-regclass.c: In function âpgpool_regclassâ: pgpool-regclass.c:99: error: âRangeVarGetRelidâ undeclared (first use in this function) pgpool-regclass.c:99: error: (Each undeclared identifier is reported only once pgpool-regclass.c:99: error: for each function it appears in.) make: *** [pgpool-regclass.o] Error 1 Can anyone help me to sort this things out?I really appreciate it. Thanks.

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• Very Large number of connections in TIME_WAIT state; Server is slow, ipconntrac

  - by Sparsh Gupta

  I have a nginx server with load balancing and reverse proxy. Right now its behing another nginx but very soon I plan to make it front, where it will receive TCP connections from clients directly at a rate of 500req/second I am having some big troubles with the server. I have pasted my configurations here and I am kinda sure that the problem is with ipconntrac and similar things which are alient to me http://paste.org/pastebin/view/28543 root@load_balancer:/proc/sys/net/ipv4# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c 67 CLOSING 727 ESTABLISHED 173 FIN_WAIT1 183 FIN_WAIT2 19 LAST_ACK 5 LISTEN 447 SYN_RECV 1 SYN_SENT 27970 TIME_WAIT Its a ubuntu machine with mainly nginx (load balancer and reverse proxy) installed. It surely isnt great. Can you help me understand whats going on and how can I fix it. This is my live server and I am sure its in a bad shape right now. Any document or commands to fix this, or settings I should make to make this better and reduce time wait and fin_wait1/2 better would be awesome.

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• dd-wrt Bonjour/ netbios etc on two subnets

  - by user72182

  Hi I was wondering if any clever people out there could help me. I have a network setup with two different subnets 192.168.1.0 and 192.168.0.0 one router is connected to a VPN (via OpenVPN) the other is not. Both routers have static routes to each other and a device on one can communicate to another without issues when using IP addresses. My problem is I want to use services like Bonjour, Netbios and Apple Talk across the two networks, which currently does not work. A laptop connected on one subnet will not see a laptop connected on another. Is there anyway that you can connect the two networks together so these sort of local service will work??? I guess I have to forward the boardcast packets but I have no idea how to do this. Thanks for any help...

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• What equipment do real ISP's use?

  - by Allanrbo

  In a dormitory of 550 residents, people often mistakenly set up DHCP servers for the whole network by plugging in their private Wi-Fi routers wrongly. Also recently, someone mistakenly configured their PC to a static IP being the same as that of the default gateway. We use cheap 3Com switches at the moment. I know that Cisco switches support DHCP snooping to solve the DHCP problem, but that still does not solve the default gateway IP takeover problem. What sort of switch equipment do real ISP's use so their customers cannot break the network for the other customers? What we ended up doing In case anyone are courious, we ended up doing seperate VLANs for each user. And as a matter of fact, not just the 550 users, but for 2500 users (11 dorms). Here's a page describing the setup: http://k-net.dk/technicalsetup/ (the section "Transparent firewall using VLANs"). There was no significant load on the router server as I feared in one of the comments below. Even at 800Mpbs.

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• Using the right folder for the right job. Article link, please?

  - by Droogans

  There are specific folders designed for specific tasks. /var/www holds your web sites, /usr/bin contains files to run your applications...yet I still find myself putting nearly all of my work in ~. Is it possible to overuse my home directory? Will it come back to haunt me? Anyone have a good link to an article of best practices for organizing your files so that they are placed in their "correct" place? Is there even such a thing in Linux? I am referring specifically to user-generated content. I do not compile applications from source, I use apt-get for those tasks. This article has a great introduction to what I'm looking for. Table 3-2, "Subdirectories of the root directory" is the sort of thing I'm looking for, but with more details/examples.

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• How to vertically split widescreen into two virtual workspaces on ubuntu/gnome?

  - by David

  My new laptop has a big 16:9 screen, and I'm finding it hard to fully utilize it during the 95% of the time that I'm not watching HD movies on it. I'd like to set it up as a kind of virtual dual screen by splitting the physical screen into two workspaces. I know I could arrange my windows manually, but I'd like to be able to maximize a window and have it only consume half the monitor, and have its pop up dialogs centered on its half-screen, that sort of thing. Is there some kind of plug in available to do this? Thanks in advance for any pointers.

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• Sharing external storage between different operating systems?

  - by CT

  I just received a Lacie 1TB external usb/firewire/esata drive. I have 2 machines. A macbook running osx 10.6 and a desktop running windows 7. I would like to rip my dvd collection to iso and store on my external. Right now I use my macbook's disk utility to rip dvds to iso. However my desktop is what is connected to my hdtv. I mainly just use the desktop for media. I'd like to format the external with a 200 GB partition for time machine backups and have the rest for storage. DVD iso are often above 8GB so that sort of eliminates FAT file systems correct? Do I have any options to be able to have my mac and pc both see the drive?

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