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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