Thanks Timothy, I have taken your advice but for some unclear reason have moved
from the frying pan into the fire.
Ths download of 14.04 went perfectly and was completed in about 30 minutes.
Upgrading followed and I stopped watching. 20 minutes later I came back to find
that the PC had shutdown.
The launching problem experienced was induced, I am fairly sure, by a PC
hardware defect and the software issue solved by installing 14.04LTS.
But not before the hardware caused numerous shutdowns. Initially I
installed 14.04 on-line. The download went effortlessly but the
subsequent upgrade wa
