In versions older than Ubuntu 7.10 gutsy the ntfs file system was not writable after mounting the file system. To make it writable you may need a package called ntfs-3g. Here are the steps to make it writable.
The ntfs file systems were read only on Linux. On the 14th of July 2006, a developer of the linux-ntfs team, Szabolcs Szakacsits, revolution this area by releasing a new driver ntfs-3g which claimed to provide full read/write support for all NTFS partition. After months of successful testing by hundreds of thousands of users in beta status, ntfs-3g is now fully stable.
For mounting NTFS you can use one small tool called NTFS-3G this is very powerfull and simple tool.
On Ubuntu 7.04 Feisty Fawn
Open the terminal and type
$ sudo apt-get install ntfs-3g ntfs-config
This will make your windows ntfs partitions writable.
On Ubuntu 6.10 Edgy Ft
Go to CLI . Then there type
$ sudo gedit /etc/apt/sources.list
Then the gedit will open and there you have to add the following lines in the last. Then save the file and exit.
deb http://givre.cabspace.com/ubuntu/ edgy main
deb http://ntfs-3g.sitesweetsite.info/ubuntu/ edgy main
deb http://flomertens.keo.in/ubuntu/ edgy main
Now update the source list by using the command
$ sudo apt-get update
If you want to install ntfs-3g run the following command from your terminal
$ sudo apt-get install ntfs-3g