OPEN PETA

Ubuntu 9.10 [code name : karmic koala ] has lot of bugs comparing previous releases and some of features have been removed in 9.10 version such as Login Screen GDM Manager . Hope Ubuntu community will fix everything soon in coming releases. Wireless connection is also not working in latest broadcom wifi hardware . Due to license problem Ubuntu does not include the broadcom wifi driver by default . User has to update manually using Ethernet internet connection after that they can activate driver in System -> Administration -> Hardware Drivers option. But the problem of this method is internet connection . What the user supposed to do if they do not have Ethernet internet connection. The solution is installing driver from source. Broadcom company providing wifi drivers for Linux . Steps are given here for how to do enable wifi driver using this method

• Download the latest driver from Broadcom website

http://www.broadcom.com/support/802.11/linux_sta.php

These packages contain Broadcom's IEEE 802.11a/b/g/n hybrid Linux® device driver for use with Broadcom's BCM4311-,                      BCM4312-, BCM4321-, and BCM4322-based hardware.

# mkdir hybrid_wl

# cd hybrid_wl

# tar xzf <path>/hybrid-portsrc.tar or <path>/hybrid-portsrc-x86_64.tar.gz

# make clean   (optional)

# make

# lsmod  | grep "b43\|ssb\|wl"

# rmmod b43

# rmmod ssb

# rmmod wl

# echo "blacklist ssb" >> /etc/modprobe.d/blacklist.conf

# echo "blacklist b43" >> /etc/modprobe.d/blacklist.conf

# rmmod wl

# mv <path-to-prev-driver>/wl.ko <path-to-prev-driver>/wl.ko.orig

# cp wl.ko <path-to-prev-driver>/wl.ko

# depmod

# modprobe wl

# modprobe lib80211

# insmod wl.ko

#vim /etc/profile

rmmod ssb

modprobe lib80211

insmod <path-to-wl.ko-file >/wl.ko

Reference : Broadcom Website

Oops , My Fedora dvd is getting struck .

What the hell is this ? why this DVD is not working  properly ?

Oh my God after 9 hours of downloading , I got problem with DVD .

Everyone could have murmured or shouted these words them self while they are facing some problem with installing ISO images. Last week  i downloaded Fedora 12 DVD -3.0 GB. but i got problem with installation due to corrupted media . I spent one day for downloading that iso image , i dont know why this iso image get corrupted . any way i tried to find the answer .  Finally i found some tips and tricks with downloading ISO images.

Reason for corrupted ISO images

1. Download Interruption or incomplete download – Use proper download manager or accelerator for downloading ISO images.
2. The ISO image might be corrupted while burning with high speed . So use 2x /4x speed in your burning application to avoid this problem
3. Forget to check with hash code  – All ISO images comes with some hash code for checking its content . user need to check after download it.

Checking ISO images using SHA1SUM or MD5SUM

The first two problem could be easily solved using download manager and setting burning speed . here some information about checking ISO image has been given for Linux users

• Download ISO images , For example :  Fedora-12-i386-DVD.iso
• Download the MD5SUM or SHA1SUM hash keys from fedora website – Save the second line into one text file [check.txt]

Hash: SHA1
f0ad929cd259957e160ea442eb80986b5f01daaffdbcc7e5a1840a666c4447c7 *Fedora-12-i386-DVD.iso

• Now use sha1sum or md51sum command for checking your ISO image . In terminal type the following command

# sha1sum    -c check.txt

or

# md5sum    -c check.txt

• If the file has no error then the output of above commands would be

Fedora-12-i386-DVD.iso: OK

• Else some error message would be displayed .

Note : The format of the checksum file is so important , it has to be like

<checksum value><TWO WHITESPACES><name of file to be checked>

In our case , the check.txt sould have

f0ad929cd259957e160ea442eb80986b5f01daaffdbcc7e5a1840a666c4447c7  Fedora-12-i386-DVD.iso

Compiling Linux Kernel is used for making your system as very customizable one . User can change kernel modules and device drivers based on their need . Suppose if i want to disable wireless support in my desktop PC [because wifi card is not available in my system] . i can recompile and disable that option in my existing kernel. In this article , the kernel compilation has been described in Six Easy Steps