Okay, picked up on this. Have two identical machines, lenovo Helix 2,
and both behave the same after the upgrade 18_04 to 20_04.
What I did, was
$ sudo apt-get --reinstall install grub-common grub-pc os-prober
to no avail.
Then, with a somewhat heavy heart
$ sudo grub-install /dev/sda
Installing for x86_64-efi platform.
Installation finished. No error reported.
Still no grub menu, however, and
Boot Info Script 0.78 [09 October 2019]
============================= Boot Info Summary: ===============================
=> Windows 7/8/2012 is installed in the MBR of /dev/sda.
=> No boot loader is installed in the MBR of /dev/sdb.
=> No boot loader is installed in the MBR of /dev/sdc.
Installed to ... where?
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https://bugs.launchpad.net/bugs/1898022
Title:
grub upgrade 18.04->20.04 loses dual-boot to W10
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