first we need to install record(if and only if you don't have it):
sudo apt-get install record
then we create an image of the CD/DVD to your hard disk drive.
sudo umount /dev/cdrom
readcd dev=/dev/cdrom f=file.iso
And we finally burn the iso image file to blank or writable CD/DVD . Right click on Image (ISO) file -> Write to Disc... -> Write
