Hi Derek, thanks for your response. I dont know what my video hardware is, but its an old PC. The installation gets as far as loading the Linux distro, I get an on screen prompt with the name and version of the distro with dots showing it is progressing, then the screen goes blank and after a few seconds the same screen comes up but this time in monochrome, then the screen goes blank & no further activity. (I have tried using an alternate iso and this goes all the way through the install process but when I get to the reboot stage it goes straight to the black screen.)
I have found a way of resolving the issue. I installed Kubuntu from a magazine cover disk and then changed it to Lubuntu using the command "sudo apt-get install lubuntu-desktop"
I still cant understand why cover disks work but iso disks dont.