Getting this message at boot time on my DELL desktop for the past week:
Time of day was not set - please run set up program.
Invalid configuration information - please run set up program.
F1 key to retry boot.
F2 key for set up utility.
F5 key to run on board diagnostics.
Must shutdown and reboot.
Everything comes back to normal.
SSD is healthy.
Hope someone can help out!
Thank you!
p.s. btw, Linux side is erased in the process (dual booting).
Do you really mean it erased your linux partition?
The partition remains intact, but Linux boot option disappears. 
Only Windows boot option remains in bios.
p.s. have dual booted for many years and this is novel issue.
-thinking it is either Microsoft who have done something in latest updates or… something physical.
-frustrated… and thinking of wiping disk and leave only Linux, but if it is a physical issue what then? Plus, still have two scanners that only work on Windows.
My first thought is that Windows uses local time and Linux uses UTC by default. If you have Windows working and then install Linux for dual boot you should change the Linux configuration to use local time too.
It sounds like you’ve done this before so that may not be the issue. I haven’t dual booted with Windows 11. Is it a new computer? Maybe it’s a UEFI vs BIOS thing.
It may be worth trying boot/grub repair from a live linux USB.
@Gary and @danielson :
good idea, Gary.
Or perhaps:
Super Grub2 Disk
Super Grub2 Disk is a live CD that helps the user to boot into almost any operating system even if the system cannot boot into it by normal means.
This allows a user to boot into an installed operating system if their GRUB installation has been overwritten, erased or otherwise corrupted.
Super Grub2 Disk can detect installed operating systems and provide a boot menu which allows the user to boot into their desired operating system
Cheers from Rosika 
Thanks Rosika
Didn’t know about Super Grub2 Disk
Good thing to have.
Regards
Gary
@danielson
It depends on whether you have Windows and Linux on the same drive or on separate drives!!!
Unfortunately, only one drive.
RealTimeIsUniversal
and
Fast boot is disabled as usual.
Have UEFI system.
Until this can be resolved…
Have since removed latest partition dedicated to Mint Cinnamon.
@danielson
If you are trying to use W11 and Linux, on the same drive, then I would strongly suggest to not use grub, but install EasyBCD in W11 and use it to find and boot the Linux partition.
I do not dual-boot my W11, but I do have a W10 laptop, booting Debian 12, with EasyBCD.
Haven’t used that program in ages!
Just noticed something…
The above message appears after shutdown + cutting off electricity to the desktop (and not after simple shutdown).
After message appears, clicking on power button shuts down the pc.
Then, another click on power button, and it goes back to Windows as expected.
On reading my first reaction was a system clock issue, i would be tempted to check the cmos battery and think about replacing that.
Would need to know the make and model of your computer to confirm the type and if its possible to replace easy.
One way of checking is when you go into the bios usually with f2, esc, f10 or del at startup. Check the system date and time, but if you have been using the machine a while it could be correct and may be best testing at a new boot when there was no power to the box for a period.
Forgot to unplug usb device before snapshot.
Usually not plugged in.
What reaction do you get from
F5 key to run on board diagnostics
Forgot to post time via BIOS, ugh!
Date was good.
Time was off by 5 hours.
Guess you have now changed the time.
Power it down leave as long as possible over night then check again without connecting to the net and see if its driffted then we can eliminate cmos battery
Can do.
Searched the web for symptoms of defective CMOS and none of them appear to be my predicament. At least, as per this page:
F5 results = all tests passed.
Yes, CMOS battery was my first thought. That was the only time I have seen this message on a PC.
So you changed it?