installing rpm packages on ubuntu

In ubuntu i have downloaded flash rpm,how to install it.i am new to ubuntu and i have tried the following

    alien -k flash-plugin-10.0.45.2-release.i386.rpm
    alien -i flash-plugin-10.0.45.2-release.i386.rpm
    rpm -i flash-plugin-10.0.45.2-release.i386.rpm //this works in rhel versions

The above doesn't seem to work..

Thanks..

From serverfault Hulk

• Installing a .rpm on Ubuntu is a last resort and should not be used when .deb packages are available.

  From Ignacio Vazquez-Abrams

• It's available in the repositories and you should use the Synaptic or aptitude package manager to install it rather than downloading and installing it manually.

  For Jaunty, Karmic and Lucid:

  sudo apt-get install flashplugin-installer
  

  For Dapper, Hardy and Intrepid:

  sudo apt-get install flashplugin-nonfree
  

  From Dennis Williamson

• The Flash plugin is also in the Canonical partner repository, the package is called adobe-flashplugin. Using this you'll automatically get security updates for Flash if they are available

  From Florian Diesch

• RPM files are for RedHat Package Manager, and generally not meant for Ubuntu...

  actually the better/preferred way would be to use Repository using #apt-get install

  since you have already downloaded RPM and wanna use the same, there are two ways you could follow

  [] using 'alien' converting *.rpm RedHat package to a *.deb Debian Package like *this you alrady performed *This will convert your RPM to a DEB {in your case should be flash-plugin-10.0.45.2-release.i386.deb} and then you can install deb with:

  #sudo dpkg -i flash-plugin-10.0.45.2-release.i386.deb

  [] other way is converting RPM to CPIO, extracting contents of CPIO and installing from the source

  #rpm2cpio flash-plugin-10.0.45.2-release.i386.rpm | cpio -dimv

  From AbhishekKr