INSTALLATION PROBLEM ON DEFINITE PARTITION

when i ask th partition manager to to install in this partition then i receive a message that no root file system defined for this partition

First off, let me give you some really helpful links to installation related guides provided by the Ubuntu Community.

Here is a link to the Ubuntu Community guide on partitioning, which I'd recommend reading over: https://help.ubuntu.com/community/forum/installation/Partitioning

If you are planning to Dual Boot with Windows, you can also consult this guide: https://help.ubuntu.com/community/WindowsDualBoot

Additional guides on Ubuntu Installation can be found here: https://help.ubuntu.com/community/Installation

You might also want to check out Wubi, which is a really, REALLY easy way of installing Ubuntu inside of Windows, which is similar to installing any windows program, and requires no partitioning. Here is a guide to Wubi: https://wiki.ubuntu.com/WubiGuide

That said, it sounds like you are choosing the option to manually edit the partition table. You must have at least two partitions for Ubuntu: a '/' partition and a swap partition ('/' without the quotes is pronounced "root"). You will get the error: "No root filesystem is defined. Please correct this from the partitioning menu." if you do not assign a partition to the '/' mount point.

The easiest way to proceed, would be to delete the partition you have made for Ubuntu, so that it is just empty unpartitioned space. I am assuming the "5.86 SEPARATE PARTITION" is a 5.86 GB partition. When you try the installation again, choose Guided (automatic) partitioning, and opt for the installer to use the largest bit of empty space on the computer. The installer will automatically create a '/' partition, and an appropriately sized swap partition in that empty space. On the following screen, the installer will inform you of what it plans to do with the unpartitioned space and you will have a chance to back up and choose a different option if you don't like it.

If you don't want to use the guided partitioning, here are some additional instructions for doing it manually.

Take the partition you have set aside for Ubuntu, and split it into two partitions: One for swap space, which is often double the amount of RAM your computer has, and the rest for your / partition, which is where the Ubuntu files will be installed to. This can be done with the partitioning application you originally used, or right in the Ubuntu installer. Since you already knew how to make a separate partition for Ubuntu, I'll skip this step.

After choosing to partition manually in the Ubuntu LiveCD installer, you will be shown all of the partitions on your computer.

*Please note: You must be very careful to correctly identify which partitions you have set aside for Ubuntu. If you have another operating system already installed on this computer, choosing to make changes to the wrong partition could cause you to loose data that is important to you. Any changes you make here can be undone, up until you click the "Install" button on the "Ready to Install" screen, which follows this one.

Click the partition you have created for '/', and click the Edit Partition button. The filesystem should be ext3, and In the Mount Point box click the arrow, and select the /, and click OK. Do the same for your Swap partition, but you won't need to specify a mount point - just choose linuxswap for the filesystem.