I have downloaded ubuntu-10.04-beta1-alternate-i386.iso and extracted the following udev packages
libgudev-1.0-0_151-5_i386.deb, libudev0_151-5_i386.deb, udev_151-5_i386.deb and used dpkg -i to downgrade and on reboot the system behaves normally i.e CD's and DVD's mount and unmount correctly.
I have downloaded ubuntu- 10.04-beta1- alternate- i386.iso and extracted the following udev packages 1.0-0_151- 5_i386. deb, libudev0_ 151-5_i386. deb, udev_151-5_i386.deb and used dpkg -i to downgrade and on reboot the system behaves normally i.e CD's and DVD's mount and unmount correctly.
libgudev-