Hah.

Sorry for panic. False alarm.

The magic commands that solve everything are

sudo mount -v --bind /mnt/@/ /mnt
sudo mount -v --bind /mnt/home/@home /mnt/home # optional

So, I've been little confused with btrfs subvolumes. Actually the above message 
is a bug in
kubuntu installer.

** Changed in: grub2 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/591454

Title:
  grub-probe: cannot find a device for /boot/grub

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