How to solve the error: 452 Error writing file: A file cannot be larger than the value set by ulimit

Posted on December 6, 2008 by Ahmed Tawfik

When trying to transfer a very big file (over ftp for example), you’ll receive the error above, this limit is a security limit in AIX and you can solve it by simply editing the /etc/security/limits file and increasing the “fsize” limit or simply changing it to “-1” to be unlimited, and then retry your transfer, you don’t have to restart the machine for changes to take effect.

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Ubuntu Connect to AIX V5.3 XServer

Posted on December 6, 2008 by Ahmed Tawfik

How to redirect graphical output of AIX to Ubuntu and run:

1) Go to System ->Administration ->Login Window->Security-> untick “Deny TCP connections to Xserver”
2) Log out and then back in
3) Type these commands in the terminal:
xhost +
telnet host_name
export DISPLAY=Client_IP:0.0
4) Run whatever x-application you need 🙂

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How to restart the audio in Ubuntu

Posted on December 6, 2008 by Ahmed Tawfik
  1. check for process pulseaudio
  2. kill it
  3. re-open it with the -D flag
  4. Audio is back 🙂
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Firefox ROCKS! Firefox Profiles

Posted on December 2, 2008 by Ahmed Tawfik

I have just disovered a feature that I needed sooooooooooo much @ work when having to access multiple networks with different proxies; this feature is ‘Profiles’. You can have many Firefoxes on the same OS :), each one with totally different settings, plugins, proxy, homepage, passwords, history…etc, here are the steps (for Ubuntu):

  1. Close ALL open Firefox windows
  2. Open a terminal and type “firefox -ProfileManager”
  3. Create new profiles as you need and don’t forget to unselect the option of not prompting in order to be prompted for the profile you need each time you start firefox
  4. Enjoy!
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Secure & Persistent Ubuntu 8.10 on USB Flash Disk

Posted on November 18, 2008 by Ahmed Tawfik

A very simple yet effective way to have Ubuntu on a flash disk with you, but not a live session as in one of my previous posts in Ubuntu 8.04, the difference between it and the live session is that the live session doesn’t provide any means of authentication which makes it useless for anyone who wants to keep his/her private data on it, and so, you’ll have to do the following:

Prerequisites:

  1. Access to Ubuntu 8.10 (Installed or Live CD)
  2. An Ubuntu 8.10 Source (.iso or a CD)

Steps:

  1. Use the Ubuntu 8.10 tool (System->Administration->Create a USB Startup Disk) and attach your USB Flash Disk to the computer and wait till it finishes.
  2. Restart the computer (make sure that you boot from the USB stick) and choose your language and then the first option in the menu (Install Ubuntu without any modifications to your system)
  3. Go to System->Administration->Login Window, Security tab, and Disable Automatic login and timed login
  4. Create a password for user “root” (From System->Administration->Users and Groups)
  5. Allow local system administrator login
  6. logout of the user “ubuntu” and login as “root” with the new password you’ve just created.
  7. Remove the existing “ubuntu” user using the command “userdel -f ubuntu”
  8. Create a new user named “ubuntu” and set its password
  9. Log out and login as the new user
  10. Enjoy!!
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