Installed Xubuntu on a Pentium 4 Machine with 512M memory and 64M Graphic card, It is super fast, but there are a few teething issues.

The first thing is that it cannot recognize CD drive. After googling, found the solution.

It is because the Linux keep pulling the floppy drive. If the floppy drive is disabled, then the CDROM can be recognised.

sudo nedit /etc/modprobe.d/blacklist.conf

blacklist floppy

sudo update-initramfs -u

CDROM running again!