I have chanced to come across a solution to the problem herein discussed
(The souce of the information provided hereafter is the forum thread of : slax.hosting4p.com/forum/viewtopic.php?p=92702&sid=a2f4cafe97887f4131e401c5 0bdaeab0 )
One is to boot with the nohotplug switch whereupon eecution the following commands :
... this solution is a valid one as far as the Acer Aspire 5720Z of mine is concerned
ln -s -f /lib/modules/126.96.36.199/kernel/drivers/char/agp/nvidia-agp.ko /lib/modules/188.8.131.52/kernel/drivers/char/agp/intel-agp.ko
I have decided to post this here on the grounds that it seems to me that the people to share this problem might have missed the link above-posted. This post is not to be considered an attempt to imply anything not explicitly stated herein.