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• java+netbeans+mysql+ubuntu 64 bits LTS VS C#+MS SQL for fast develop trading system

  - by crunchor

  I am going to build a trading system and use with the broker "Interactive Broker" API. The API supports C++ Socket, Java Socket, DDE, Active X APIs in Windows. The API supports Java Socket API, Posix C++ Socket API in Unix kind like Ubuntu. My trading system has some real time long calculations to do and a lot of maths for backtest. I am using a retail trading program Amibroker which is written in C++ and I run it in windows xp 32 bits, it will take me days to do one serious backtest with my G620 Sandy Bridge CPU and 3GB of ram. So for my trading system, I need to have 1. speed, 2. stability, 3. fast development I have done some research, C++ is fastest but I am not good at it and it takes much longer time to develop. Other than C++, Java in linux has the best speed. I also did some research for database and look like mysql has the best speed. Mysql and PostgreSQL both are very popular open source sql db, which one should I choose? I see MySQL has Workbench now which looks like similar to MS SQL management studio so look like a good start. Netbeans should be the most popular Java IDE now and seem like its GUI design can be as easy as Virtual Studio now. I am not sure if made by Netbeans would affect the speed and if its GUI design is really that good and easy to use. Ubuntu 64 bits LTS has good long term support, good community support, and stable. I will buy a new computer if I can create a good trading system for live trading and backtest. Very likely I will buy a I7 or I5 depends on if I7 can really have better speed for my case. Actually I mainly deal with C# in my jobs and I just knew java but not good at java. What would you guys recommend? Any better solution? This will be a big project and very likely life long project for me so I seriously do research including asking you guys before I start and focus on what I should, thanks!

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• DELL Inspiron 9400 SD Card Reader not working on 10.11 ubuntu

  - by Mario Martz

  Im new in linux, just installed Ubuntu 11.10 in a Dell Inspiron 9400, everything works fine with the exception of the SD card reader, everytime I insert a card the computer doesnt do anything, its like the SD card reader is not there. I did a $lspci and it shows the next drivers 03:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller 03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19) 03:01.2 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 0a) 03:01.3 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 05) Everytime I insert a memory card, dmesg shows the next d status 0x600b00 [ 2687.227351] end_request: I/O error, dev mmcblk0, sector 64 [ 2687.229436] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.229440] end_request: I/O error, dev mmcblk0, sector 65 [ 2687.230512] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.230515] end_request: I/O error, dev mmcblk0, sector 66 [ 2687.231588] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.231592] end_request: I/O error, dev mmcblk0, sector 67 [ 2687.232674] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.232678] end_request: I/O error, dev mmcblk0, sector 68 [ 2687.234763] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.234766] end_request: I/O error, dev mmcblk0, sector 69 [ 2687.236864] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.236868] end_request: I/O error, dev mmcblk0, sector 70 [ 2687.238942] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.238946] end_request: I/O error, dev mmcblk0, sector 71 [ 2687.238949] Buffer I/O error on device mmcblk0, logical block 8 [ 2687.241028] mmcblk0: retrying using single block read [ 2687.243104] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.243108] end_request: I/O error, dev mmcblk0, sector 64 [ 2687.245212] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.245215] end_request: I/O error, dev mmcblk0, sector 65 [ 2687.247298] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.247302] end_request: I/O error, dev mmcblk0, sector 66 [ 2687.248389] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.248393] end_request: I/O error, dev mmcblk0, sector 67 [ 2687.250476] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.250480] end_request: I/O error, dev mmcblk0, sector 68 [ 2687.252617] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 [ 2687.252621] end_request: I/O error, dev mmcblk0, sector 69 [ 2687.254737] mmcblk0: error -110 sending read/write command, response 0x0, card status 0x600b00 and more of the same but with different sector number Im using Kernel 3.0.0-12-generic By the way, when I was installing it and ubuntu asks about installation (If I want to install it along with windows or delete something or change the partitions of the HDD) if I go to the window to change the partition of the disc, linux detects the SD Card (if there's one inserted course). Any help with this it would be appreciated -sorry for my english Thank you

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• Core Parking in Ubuntu?

  - by Xxx Xxx

  Core parking is a new feature that introduced in Windows 7 to get better Battery performance . Depending on the resource use of the operating system it may park one or multiple cores of a multi-core cpu to reduce the computer’s power consumption and thermal emissions. Once operations require more processing power, the parked cores are activated again to assist in the tasks So my question is that is there any way i can do it on Ubuntu 12.04 " Core Parking " ?

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• How to reinstall Ubuntu keeping my data intact?

  - by Santosh Linkha

  I want to reinstall Ubuntu keeping my data intact. I have 160 GB hardrive (sata or pata I don't know but it's slim and made in China) with a 40 GB ext3 partition, a 4GB swap memory and 3 other partition with a FAT32 file system. I have around 4GB space on my drive where Linux is installed. I'd like to keep the data intact, especially the Downloads folder, desktop, and /var/www; And I no longer have access to any other machines or external storage devices.

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• Best partition Scheme for Ubuntu Server

  - by K.K Patel

  I am going to deploy Ubuntu server having Following servers on it Bind server, dhcp server, LAMP Server, Openssh Server, Ldap server, Monodb database, FTP server,mail server, Samba server, NFS server , in future I want to set Openstack for PAAS. Currently I have Raid 5 with 10TB. How should I make my Partition Scheme So never get problem in future and easily expand Storage size. Suggest me such a partition Scheme with giving specific percentage of Storage to partitions like /, /boot, /var, /etc. Thanks In advance

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• Go to the parent directory in Files/Nautilus Ubuntu 12.10

  - by Piotr Nowicki

  In Ubuntu 12.10 (Gnome3) they've removed the "go to parent directory" using Backspace. I was very used to it... I've seen in source code comments that they've removed this support and there are at least 3 other ways of achieving the same. I wonder - what are other ways besides the Alt + up? Basically, I'd like to find out how to enable the Backspace key to go to the parent directory or at least know the shortcut for doing it with one hand (Alt + up is useless).

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• Ubuntu 12.04 does not recognize Kingston DT108 16GB memory

  - by aceqott

  I bought a Kingston DT108 16GB and Ubuntu did not recognize it.What should i do?? Output of dmesg | tail after connecting pen drive [ 1455.253010] CPU5: Package power limit notification (total events = 488) [ 1455.253013] CPU1: Package power limit notification (total events = 489) [ 1455.263966] CPU4: Package power limit normal [ 1455.263969] CPU2: Package power limit normal [ 1455.263972] CPU0: Package power limit normal [ 1455.263975] CPU6: Package power limit normal [ 1455.263998] CPU1: Package power limit normal [ 1455.264001] CPU5: Package power limit normal [ 1455.264004] CPU7: Package power limit normal [ 1455.264007] CPU3: Package power limit normal

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• vi issue in SSH TTYs to Ubuntu 14.04.1 LTS

  - by Steve Campbell

  After upgrading my server to Ubuntu 14.04.1 LTS, I can no longer use the vi editor to edit anything in an SSH terminal (I access the server by launching ssh sessions from Cygwin running on Windows). The empty portions of the vi window fill with garbage. The workaround is to launch an xterm from the server back to my Cygwin/X display. Using vi from within the xterm works fine. Setting my TERM to vt100/vt220/xterm does not help.

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• Licence Error for Matlab 2012a on Ubuntu 12.04 (64-bit)

  - by MalTec

  I have installed Matlab 2012a on ubuntu 12.04, while providing the licence I find the following error: Could not complete Activation because the License File could not be written to disk. You might not have write permission on the License File or the folder. /usr/local/MATLAB/R2012a/licenses/license_Malhar-PC_161052_R2012a.lic See your System Administrator for assistance. The specific error message text is: /usr/local/MATLAB/R2012a/licenses/license_Malhar-PC_161052_R2012a.lic (No such file or directory).

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• Can't install any ubuntu on HP Pavillion DV6-6B01AX 15.6 HD/AMD QC A6

  - by Mohamed Bassyouni

  I have tried over 50 times all different ways to install Ubuntu on (HP Pavillion DV6-6B01AX 15.6 HD/AMD QC A6) from v9 to 12.04 but no success. Every time after booting from the DVD or CD and when asked to install along with Windows 7, I click the Next button but then it goes to shut down, says remove media and press any key. I don't want install it over Windows 7, I want to keep Windows 7. Any help?

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• Mount VMware Shared Folder to Ubuntu 12.04.3

  - by Chef Pharaoh

  I tried to create a shared folder to my Ubuntu 12.04.3 VM using VMware 5 from my Mac but I don't see the folder anywhere. I've tried to use some commands as suggested here and here, but nothing is still showing... I just get the error: Error: cannot canonicalize mount point: No such file or directory So I make the folder I'm trying to mount to or just try to mount directly to my home folder and get this error now: Error: cannot mount filesystem: No such device Any help is appreciated.

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• Ubuntu 11.04 Broadcom BCM4312 Not Working

  - by ptran221

  I have a HP MINI 210-1010NR and just installed Ubuntu 11.04 and I can't get my wireless to work.I have checked through multiple Q&A's throughout this FAQ and tried them all. When I go over the wireless thing at the top it says "Wireless Networks device not ready(firmware missing)." Okay, now here is my ~$ lspci -vvnn | grep 14e4 02:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01) Also, when I try to open additional drivers it says that "Downloading package indexes failed, please check your network status."

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• installing Oracle Database 10g XE Server in Ubuntu 11.04, "E: Unable to locate package oracle-xe"

  - by Nguyen Phi Vu

  I have read many posts for installing Oracle Database 10g XE Server in Ubuntu, such as this But I get an error: E: Unable to locate package oracle-xe when execute the command sudo apt-get install oracle-xe At the previous step (sudo apt-get update), it also notices that E: Some index files failed to download. They have been ignored, or old ones used instead. Did any one meet and solve this problem? I have searched for this problem but got no proper answer.

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• What are the common maintenance tasks on ubuntu?

  - by DaNieL

  When i was using windows, i used to run defrags, ccleaner and revouninstaller once a month to keep the system and the registry clean. I know ubuntu (and all linux distro) has a different system structure and doesnt need defrags, but i've heard there are some mainenance tasks that help to keep the system clean (for example, sudo apt-get clean or sudo apt-get autoremove) How many of those commands/software (and please explain what they do and if they can compromise the system stability) do you know and use regularly?

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• ZTE USB Modem AC2736, connection not possible in Ubuntu 12.04.1 LTS

  - by Fredo

  It's a long post but nearly covers all my experiments and changes I did to my NM. Hope the information is complete and if there are still question, more information can be provided. I've a ZTE AC2736 USB Modem (CDMA modem) which worked fine in Ubuntu 10.04 /11.10. I recently switched to 12.04.1 (precise pangolin). after the switch the first issue I faced was to connect to internet using my USB modem (ISP: Reliance Brand: Netconnect). Tried to run the drivers provided by Reliance but they are old and won't support Kernel 2.6.30 above. since the code was not downloaded with ISO image (of 12.04) i couldn't compile the files provided in such driver. lsusb does detect it as Modem with output similar to 19d2:fff1 ZTE CDMA technologies inc. (or similar as i didn't note it down) If it is detected as USB storage it shows 19d2:fff5 (as per few online forums, i may be wrong here). I used the network Manager and configured the modem to dial #777 (default) and the ISP provided username:password combination. It tries to connect to internet (3-4 times automatically)but fails to get online. once I was able to connect in the monring hours and the message was flashed 'registered on CDMA home network'. I was able to run an update. the kernel was updated with 3.0.2 -pae OR something similar (can find out if required). I surfed the net for about 2 hours later before restarting. After the restart, again the Modem was not able to get me online. I kept trying for many times. I tried changing the setting in NM. One evening after dark I was able to connect to network with same message flash 'registered on CDMA home network' (the message was similar, i'm not precise here,sorry). I was able to surf the net for nearly 3 hours before I switched off my Laptop. I'm not able to get online after that day, It's been 3 days now. I'll try the observered theory of late/early hours sometime soon as mentioned below. Laptop configuration : Make: Lenovo Model: B480 Processor: Intel B950 RAM: 4G DDR3 HDD: 500 G Broadcom Wireless/Bluetooth/Ethernet LAN OS: FreeDOS / Ubuntu 12.04 LTS (dualboot) Kernel 3.0.2-pae Obeservation : I'm able to connect to internet in those hours when generally the speed is high (low usage by other network (wireless) users). like in early mornings or late nights. This is strange as connection should not be dependent on bandwidth usage. Any help would be appraciated to fix this issue. before I decide to cahnge the OS or ISP.

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• Stuck on Ubuntu screen during installation of 12.10

  - by Rick de Groot

  From 12.04 I changed to win 8 consumer preview and now i want to go to 12.10, however i cant seem get past the Ubuntu loadingscreen( with the dots going from white to yellow etc.) it has taken more then an hour now and all my DVD drive does is speed up and slow down every 3 seconds. So i tried it again, but nothing changed im stuck on the same spot. what could cause this problem? And even better, how do i solve it?

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• How do I configure Ubuntu's web applications? [closed]

  - by Igor Zinov'yev

  Ubuntu 12.10 has introduced among other things web applications that add launcher widgets to show, for example, unread Gmail message counts, twitter tweets, etc. While sites that support those widgets show notifications offering to install them, I can't seem to find how to configure them. I'm particularly interested in configuring Google mail desktop notification widget to only display unread counts for my inbox, and dismiss all other labels.

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• Unable to install Apache 2.2.22 in Ubuntu 12.04

  - by Martin Betz

  I am not able to install Apache 2.2 in Ubuntu 12.04. Here is a snippet from my console log (sorry, it is in German): apache2 : Hängt ab von: apache2-mpm-worker (= 2.2.22-1ubuntu1) soll aber nicht installiert werden oder apache2-mpm-prefork (= 2.2.22-1ubuntu1) aber 2.2.22-1ubuntu1.1 soll installiert werden ... That means like: apache2 depends from apa..worker, but that should not get installed OR from ap...prefork..ubuntu1, but ap...prefork..ubuntu1.1 should get installed. I have no idea how to tackle that issue..

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• Automaticaly add virtual hosts in ubuntu

  - by user208202

  I want to create a simple web interface with username, password and domain. Once the users gives the information, a script will be executed creating the host with the name that the user has given and give permissions to access phpmyadmin, upload a file with filezilla. I use ubuntu, with apache and mysql installed. I found many web based interfaces and tutorials how to manually create virtual hosts but I want an automated self made solution. Can anyone help me? Thanks in advance

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• Download speed in ubuntu

  - by Shagun

  When I use IDM to download anything on my Windows I get a speed of around 4-5 Mbps but for the same connection speed in Ubuntu (12.04) is around 600kbps. I tried wget, Kget Uget and so many other download managers but no increase in speed.Also none of these was as user friendly or efficient as IDM like they don't give an option of downloading things on their own. Each time I have to open the the application and manually type in the url. What are the options available for me?

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• unable to connect mobile broadband ubuntu 12.10

  - by Anurag Srivastava

  i recently installed ubuntu 12.10 on my desktop. now the mobile connection was not working, which i later found out to be a bug in modem manger so i downgraded it to v0.5.2 but still the problem persists. whenever i try connecting, the mobile broadband option gets automatically disabled. i have a bsnl EVDO connection, which i had to manually configure as the device was not automatically detected at first.

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• qemu -cdrom ubuntu.iso -boot d -net nic,model=virtio -m 1024 -curses

  - by Gert Cuykens

  How do I disable frame buffers in Ubuntu 13.10 Saucy kernel, I tried all kinds of kernel parameters but none work? DEFAULT ramdisk LABEL ramdisk kernel /casper/vmlinuz append boot=casper toram initrd=/casper/initrd.img -- vesafb.nonsense=1 LABEL isotest kernel /casper/vmlinuz append boot=casper integrity-check initrd=/casper/initrd.img -- vesafb.nonsense=1 LABEL memtest kernel /install/memtest append - DISPLAY isolinux.txt TIMEOUT 300 PROMPT 1

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• Ubuntu 12.10 Wine Crash Error Help

  - by Hao

  I'm trying to get wine to work for Hawken. I used winetricks and installed all the necessary components. Wine works fine with other games I have installed but when I try to run Hawken it crashes while loading with the following error: fixme:iphlpapi:CancelIPChangeNotify (overlapped 0xf2afb8): stub I'm new to Ubuntu so I have no idea how to fix this. Any help would be much appreciated. *Update: I've done some backtracking and it seems that this error is caused by the launcher not wine itself.

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• Ubuntu LiveCD/USB image that boots directly to low graphics desktop

  - by user14146

  I use Ubuntu as a diagnostic tool sometimes, and it would be great to get a modification that lets you boot directly to the LiveCD desktop, preferably with the special effects dialed down. Is there such a tool? Unetbootin doesn't seem to let you do this, and Remastersys could probably do this, but I'd have to dig into the code quite a bit and figure out what to remove, which I can do, but I figured someone might have already done this and would save me the trouble.

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• How to change color AND width of non overlay scrollbars in Ubuntu 12.04

  - by Chuqui

  I know many people have complained about the almost invisible and not usable scrollbars in recent versions of Ubuntu, even after removing or disabling the default overlay scrollbars. I wonder how can I easily change their color AND width. I have a 13.3 inches monitor with a 1600*900 resolution and I can barely see them, as you can see in these images: I already changed Firefox, LibreOffice and some other software's scrollbars using GNOME Color Chooser: By the way, I'm using Unity. Thanks!

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