Kububtu won't reboot

[Phil]

Thank you for reading this.

Eighteen months ago I cloned a small SSD to a larger one using 
Clonzilla. Only because I wanted to keep Windows 7 on my dual boot 
laptop and I didn't have the original Windows installation disk. 
Everything was good except I couldn't reboot either from Windows or 
Kububtu. Instead the Intel Boot Agent displays a list of boot devices 
and the SSD isn't on that list.

So, after growing tired of powering down and then up again (because 
reboot didn't work) I upgraded to Windows 10 and did a fresh install of 
Kubuntu 20.04. Windows 10 will reboot and Kubuntu did initially until I 
restored my home directory. Something in the restored files is 
preventing a reboot. I renamed .kde but that is not the problem.

Can anyone suggest why Kubuntu won't reboot?

-- 
Regards,
Phil