In Ubuntu Hardy Heron, firefox always open in offline mode. This is really very annoying.To open firefox always in online mode do the followings :

1. Open firefox

2. In the address bar type the following and then press enter

about:config

3. In the filter bar paste the following :

toolkit.networkmanager.disable

4. Double click on it and make its value to “true”.

5. Restart firefox.

Now firefox will always open in online mode.

Turn on bluetooth on your phone and Computer/Laptop.If you’ve already tried connecting them before, delete any reference to your bluetooth phone’s ID from your computer. To do this, type Alt+F2 and then type the following :

gksudo nautilus /var/lib/bluetooth/

( Enter password to give permission )

Now delete all files/folders there. Then turn off & then turn on computer’s bluetooth device. Then scan bluetooth device from your phone and add your computer as paired device.

( Enter the same pass code in both phone and computer. )

Now find the MAC address of your phone by typing the following command :

hcitool scan

Copy the MAC address. It looks like XX:XX:XX:XX:XX:XX

Now we need to find out what channel to connect to. For this type the following command :

sdptool browse XX:XX:XX:XX:XX:XX

( XX:XX:XX:XX:XX:XX <– This is your phone’s MAC address here )

In my case it looks like

siddhartha@ubuntu:~$ hcitool scan
Scanning …
00:19:2D:C1:D3:E1    Neo
siddhartha@ubuntu:~$ sdptool browse 00:19:2D:C1:D3:E1
Browsing 00:19:2D:C1:D3:E1 …
Service Name: Dial-up networking
Service RecHandle: 0×1018f
Service Class ID List:
“Dialup Networking” (0×1103)
“Generic Networking” (0×1201)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 1            <—– Find this channel number
Language Base Attr List:
code_ISO639: 0×656e
encoding:    0×6a
base_offset: 0×100
Profile Descriptor List:
“Dialup Networking” (0×1103)
Version: 0×0100

Service Name: Nokia PC Suite
Service RecHandle: 0×10190
Service Class ID List:
“Serial Port” (0×1101)
Protocol Descriptor List:
“L2CAP” (0×0100)
“RFCOMM” (0×0003)
Channel: 15
Language Base Attr List:
code_ISO639: 0×656e
encoding:    0×6a
base_offset: 0×100

The Channel number for Dial-up Networking is pointed above. Now configure the bluez. Just type the following command in the terminal :

sudo gedit /etc/bluetooth/rfcomm.conf

Add the following text at the end :

rfcomm0 {
bind yes;
device XX:XX:XX:XX:XX:XX;          <—– Insert your phone’s MAC address here
channel 1;
comment “Mobile Dialup”;
}

Now restart bluetooth service by typing the following command :

sudo /etc/init.d/bluetooth restart

Then configuring PPP. Just run the following in terminal :

sudo gedit /etc/ppp/peers/BluetoothDialup

Now you see a blank text file. Then paste the following on the file

debug
noauth
connect “/usr/sbin/chat -v -f /etc/chatscripts/BluetoothDialup”
usepeerdns
/dev/rfcomm0 115200
defaultroute
crtscts
lcp-echo-failure 0

Save and close the BluetoothDialup file. Then run the following :

gksudo gedit /etc/chatscripts/BluetoothDialup

Now you see a blank text file. Then paste the following text on the text file, replacing your-apn and your-data-profile-number with the APN & data-profile-number from your data services provider. If you don’t know your apn (access point name) contact with your operator’s help line.

TIMEOUT 35
ECHO ON
ABORT ‘\nBUSY\r’
ABORT ‘\nERROR\r’
ABORT ‘\nNO ANSWER\r’
ABORT ‘\nNO CARRIER\r’
ABORT ‘\nNO DIALTONE\r’
ABORT ‘\nRINGING\r\n\r\nRINGING\r’
” \rAT
OK ‘AT+CGDCONT=1,”IP”,”your-apn-here”‘     <—– Insert access point name (APN)
OK ATD*99#    <—– Insert your-data-profile-number-here
CONNECT “”

Save and close the file.

To connect run the following command in terminal :

pon BluetoothDialup

To disconnect type the following command in terminal :

poff BluetoohDialup

Type “about:config” into the address bar and hit enter. In the filter box, type the following

network.http.pipelining

Double click on it and make it “true”.

Then again, type the following in the filter box

network.http.proxy.pipelining

Again, double click on it and make it “true”.

Similarly type the following in filter box and set it to 20. This means it will be able to make 20 requests at a time.

network.http.pipelining.maxrequests

Now, right-click anywhere and select New-> Boolean

and name it

network.http.pipelining.firstrequest

and set it to “true”.

Normally the browser makes one request to a web page at a time. After enabling pipelining, it will make several request at once, which really speeds up page loading.

Lastly right-click anywhere and select New-> Integer. Name it

nglayout.initialpaint.delay

and set its value to “0″. This value is the amount of time the browser waits before it acts on information it receives. Also create another integer

content.notify.interval

and set its value “0″.

When you go to download multiple files you may notice that Firefox will only let you download two files at a time. If you want to download more you have to increase the number of connections Firefox can make. Type the following in the filter box

network.http.max-persistent-connections-per-server

and set its value to 8. Now you can able to download 8 files simultaneously.

Google Chrome OS is an open source, lightweight operating system that will initially be targeted at netbooks. Later this year Google will open-source its code, and netbooks running Google Chrome OS will be available for consumers in the second half of 2010. Because Google is already talking to partners about the project, and they will soon be working with the open source community, they wanted to share their vision now so everyone understands what they are trying to achieve.

Speed, simplicity and security are the key aspects of Google Chrome OS. They are designing the OS to be fast and lightweight, to start up and get you onto the web in a few seconds. The user interface is minimal to stay out of your way, and most of the user experience takes place on the web. And as they did for the Google Chrome browser, they are going back to the basics and completely redesigning the underlying security architecture of the OS so that users don’t have to deal with viruses, malware and security updates. It should just work.

Google Chrome OS will run on both x86 as well as ARM chips and they are working with multiple OEMs to bring a number of netbooks to market next year. The software architecture is simple — Google Chrome running within a new windowing system on top of a Linux kernel. For application developers, the web is the platform. All web-based applications will automatically work and new applications can be written using your favorite web technologies. And of course, these apps will run not only on Google Chrome OS, but on any standards-based browser on Windows, Mac and Linux thereby giving developers the largest user base of any platform.

Google Chrome OS is a new project, separate from Android. Android was designed from the beginning to work across a variety of devices from phones to set-top boxes to netbooks. Google Chrome OS is being created for people who spend most of their time on the web, and is being designed to power computers ranging from small netbooks to full-size desktop systems.

Want to login with all your yahoo id’s at once, well here is how you do it without any extra software to install. You just have to edit the registry & the good thing is it works for all the versions of Yahoo Messengers. Just follow these steps.

* Go to START->RUN-> Type ‘regedit’ and press ENTER.

* Then navigate to

‘HKEY_CURRENT_USER\Software\Yahoo\Pager\Test’

* Now in the right pane right click New->DOWRD Value. Name it as ‘Plural’.

* Now Double click the the Plural DWORD you created & set the value to 1

User Account Control (UAC) can help you prevent unauthorized changes to your computer. It works by prompting you for permission when a task requires administrative rights, such as installing software or changing settings that affect other users.

I don’t recommend turning User Account Control off. If you do turn it off, you should turn it back on as soon as possible.

1. Open User Accounts by clicking the Start button , clicking Control Panel, clicking User Accounts and Family Safety (or clicking User Accounts, if you are connected to a network domain), and then clicking User Accounts.

2. Click Turn User Account Control on or off.  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

3. Select the Use User Account Control (UAC) to help protect your computer check box to turn on UAC, or clear the check box to turn off UAC, and then click OK.

Ubuntu is crippled on the multimedia front. This is because of copyright and patent restrictions that complicate distribution of proprietary codecs with Ubuntu, which prides itself as a totally free operating system. Even though Ubuntu developers haven’t included proprietary codecs, they have made it extremely easy for you to install them later through the Medibuntu repository. You can get encrypted DVD playback, Adobe Flash plugin and non-native media files (Windows media, Apple QuickTime, Real, MP3) support by using this single command. Open the terminal (Applications -> Accessories -> Terminal) and enter the following command :

sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list && sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update && sudo apt-get install libdvdcss2 w32codecs

The above command downloads all the required codecs from the Medibuntu repositories and makes your Ubuntu box multimedia ready.

Note : The above command is for 32 bit processors. AMD 64bit users, replace the ending word w32codecs with w64codecs. PPC users replace w32codecs with ppc-codecs.

Once you have run the above command, you can easily install third party applications like Skype, Google Earth and Acrobat Reader.

Skype :

sudo apt-get install skype

It is very common fact that sometimes we login to Gmail in public computers (like in cyber cafe) and forget to sign out from gmail. So, anyone can access your Gmail from that computer. Our email may contain very sensitive and secret data which we don’t want to share with others. Recently Gmail has introduced a new option by which any user can sign out their Gmail account remotely. At the bottom of your inbox, you’ll see information about the time of the last activity on your account and whether it’s still open in another location.

You can see more details about your recent activity by clicking on the Details link.

Click on the “Sign out all other sessions” button to sign out of the account which are currently open.

Enter this command in terminal

lsusb

It will give :-

siddhartha@ubuntu:~$ lsusb

Bus 002 Device 002: ID 0951:1613 Kingston Technology

Bus 002 Device 001: ID 0000:0000

Bus 001 Device 007: ID 0421:04c4 Nokia Mobile Phones

Bus 001 Device 001: ID 0000:0000

than enter the following command :-

siddhartha@ubuntu:~$ sudo /sbin/modprobe usbserial vendor=0×421 product=0×4c4

[[  Create your wvdial.conf by running the following

sudo wvdialconf /etc/wvdial.conf ]] or …

siddhartha@ubuntu:~$ wvdialconf create

Scanning your serial ports for a modem.

ttyS0<*1>: ATQ0 V1 E1 — failed with 2400 baud, next try: 9600 baud

ttyS0<*1>: ATQ0 V1 E1 — failed with 9600 baud, next try: 115200 baud

ttyS0<*1>: ATQ0 V1 E1 — and failed too at 115200, giving up.

Modem Port Scan<*1>: S1 S2 S3

WvModem<*1>: Cannot get information for serial port.

ttyACM0<*1>: ATQ0 V1 E1 — OK

ttyACM0<*1>: ATQ0 V1 E1 Z — OK

ttyACM0<*1>: ATQ0 V1 E1 S0=0 — OK

ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 — OK

ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 — OK

ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 — OK

ttyACM0<*1>: Modem Identifier: ATI — Nokia

ttyACM0<*1>: Speed 4800: AT — OK

ttyACM0<*1>: Speed 9600: AT — OK

ttyACM0<*1>: Speed 19200: AT — OK

ttyACM0<*1>: Speed 38400: AT — OK

ttyACM0<*1>: Speed 57600: AT — OK

ttyACM0<*1>: Speed 115200: AT — OK

ttyACM0<*1>: Speed 230400: AT — OK

ttyACM0<*1>: Speed 460800: AT — OK

ttyACM0<*1>: Max speed is 460800; that should be safe.

ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 — OK

Found an USB modem on /dev/ttyACM0.

Modem configuration written to create.

ttyACM0<Info>: Speed 460800; init “ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0″

than edit Wvdial file :-

siddhartha@ubuntu:~$ sudo gedit /etc/wvdial.conf

[Dialer Defaults]

Init1 = ATZ

Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0

Init3 = AT+CGDCONT=1,”IP”,”airtelgprs.com”

Modem Type = USB Modem

Baud = 460800

New PPPD = yes

Modem = /dev/ttyACM0

ISDN = 0

Phone = *99#

Password = airtel

Username = airtel

Stupid Mode = 1

Save and exit

To connect to internet type the following command :-

siddhartha@ubuntu:~$ wvdial

than this will appear

–> WvDial: Internet dialer version 1.60

–> Cannot get information for serial port.

–> Initializing modem.

–> Sending: ATZ

ATZ

OK

–> Sending: ATQ0 V1 E1 s0=0 &C1 &D2 +FCLASS=0

ATQ0 V1 E1 s0=0 &C1 &D2 +FCLASS=0

OK

–> Modem initialized.

–> Sending: ATDT*99#

–> Waiting for carrier.

ATDT*99#

CONNECT

~[7f]}#@!}!} } }2}#}$@#}!}$}%\}”}&} }*} } g}%~

–> Carrier detected. Starting PPP immediately.

–> Starting pppd at Sun Jun 15 05:17:27 2008

–> Warning: Could not modify /etc/ppp/pap-secrets: Permission denied

–> –> PAP (Password Authentication Protocol) may be flaky.

–> Warning: Could not modify /etc/ppp/chap-secrets: Permission denied

–> –> CHAP (Challenge Handshake) may be flaky.

–> Pid of pppd: 6401

–> Using interface ppp0

–> pppd: x?[06][08]

–> pppd: x?[06][08]

–> pppd: x?[06][08]

–> pppd: x?[06][08]

–> local IP address 117.98.4.246

–> pppd: x?[06][08]

–> remote IP address 10.6.6.6

–> pppd: x?[06][08]

–> primary DNS address 202.56.230.5

–> pppd: x?[06][08]

–> secondary DNS address 202.56.240.5

–> pppd: x?[06][08]

Connection successful.

Press Ctrl+c to disconnect .