I was looking around and found this:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3,8G     0  3,8G   0% /dev
tmpfs           786M  3,5M  783M   1% /run
/dev/sda8        28G   18G  9,0G  66% /
tmpfs           3,9G  277M  3,6G   8% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
/dev/loop1       56M   56M     0 100% /snap/core18/1885
/dev/loop0      240M  240M     0 100% /snap/chromium/1328
/dev/loop3       31M   31M     0 100% /snap/snapd/9279
/dev/loop2       63M   63M     0 100% /snap/gtk-common-themes/1506
/dev/sda6       453M  173M  253M  41% /boot
/dev/sda9        93G   73G   16G  83% /home
/dev/sda2       993M   33M  960M   4% /boot/efi
tmpfs           786M   20K  786M   1% /run/user/1000

Maybe; but I wouldn't be too sure that it was like that before, with the
/boot/efi.

It was strange though, that after having added *buntu to W10 some two years 
ago, though without a hitch, I had found two W10 boot partitions in grub, I 
think sda2 and sda3. Both had booted properly, whichever I selected. Never 
understood that; and never really bothered. 
Maybe, only maybe, this helps explaining the misbehaviour encountered at 
upgrade?
Btw. sda3 is now fat32, with the label SYSTEM_DRV.

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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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