Wireless Network controller [0280]: RaLink RT3090 Wireless 802.11n 1T/1R PCIe [1814:3090] not working on MSI GX640 notebook when using built-in rt3090sta driver in Ubuntu 10.04 LTS

I just installed ubuntu 10.04 into my notebook MSI GX640, but I have problems with my wireless network since it doesn't appear to be working.

Looking into some forums and answers it seams that the problem is with the Wireless driver. This is my Network controller as I get when I run the command "lspci -v | less"

05:00.0 Network controller: RaLink RT3090 Wireless 802.11n 1T/1R PCIe
        Subsystem: Micro-Star International Co., Ltd. Device 6891
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at d0200000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: rt3090
        Kernel modules: rt3090sta

As it is shows the network driver that I was looking for is the RT3090. As I found in the forums the answer to make this work is to do:

   $: sudo add-apt-repository ppa:markus-tisoft/rt3090
   $: sudo apt-get update
   $: sudo apt-get install rt3090-dkms

But when I try to do the command "$: sudo apt-get update" it returns me this error:

    Err http://ppa.launchpad.net lucid/main Packages
    404 Not Found

    W: Failed to fetch http://ppa.launchpad.net/markus-tisoft/rt3090/ubuntu/dists/lucid/main/binary-i386/Packages.gz 404 Not Found

    E: Some index files failed to download, they have been ignored, or old ones used instead.

I tried to remove the repository to redo everything again, using the "ppa-purge" but when I tried it gives me this error:

~$ sudo ppa-purge ppa:markus-tisoft/rt3090
PPA to be removed: markus-tisoft rt3090
Warning: Could not find package list for PPA: markus-tisoft rt3090

Thanks for the help, am really looking forward to put the Wireless driver to work so I'll thank very much any advice to fix this :)

If it is need it to help me find my answer, my kernel version is 2.6.32-23