There have been a number of annoying messages, that I have noticed, during boot, over the period of a few months.
The GRUB dialog text says: “…0.000000 Fast TSC Calibration failed - ERROR”
I have tried to research this reasonably, and based on other Forum Posts in Install/Boot/Login
and elsewhere, that I should not be worried by this, that it is not a big deal. TSC is a Time Stamp Counter register
that has contents incremented by value of one in each processor clock. Eventually the process
fixes itself later on.
You can run a terminal interface command line in code:
sudo cat /var/log/messages.log | grep TSC
Reading the results of this you can see the TSC register output.
I hope this may help others who have had this error.