Thank you so much Magic Banana! Next time this issue happens when I'm booting
into Trisquel I shall follow your instructions and post the logs to this
thread.
In relation to 'Metacity', I did change the 'Window Manager and Effects' in
'System Setting' from Compiz to Metacity because I thought it might help, but
it has made no difference.
To my knowledge I don't believe any hardware is failing on my Acer Aspire
5536 but I do believe there is possibly a hardware compatibility issue with
my ATI Radeon HD 3200 Graphics card but that's nothing new as the drivers are
not open sourced, therefore I am using the default desktop environment: Gnome
Fallback(Classic) and have had no issues with Trisquel 5.5 under the same
hardware.
Anyway, thanks again and I will be back with the logs.
Steve