[Bug 1816240] Re: Impossible to boot 18.04.2 from btrfs

[BertN45]

I tried to reconstruct the issue using Virtual Machines. I took an Ubuntu 18.04.2 VM with Linux 4.15 and added a second disk. I booted that VM from the ISO with Xubuntu 18.04.2 and installed Xubuntu on that second disk and it rebooted after install without any problem. 
So I have to retry it on the real hardware. 

However I rebooted Ubuntu from the first ext4 disk and that showed a
part of the problem. The command 'update-grub' does not detect the btrfs
system see my annex.

The ext file manager shows the btrfs disk with the @ and @home folders a
second window of the file manager shows the @ root (sub-)volume. However
the terminal with the update-grub shows, that update-grub does not
detect the btrfs system.

I try it again on the real HW now, with its many many partitions and
many disks. I use my gsm for the photos.

** Attachment added: "btrfs-from-ext4-os.png"
   https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1816240/+attachment/5239326/+files/btrfs-from-ext4-os.png

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https://bugs.launchpad.net/bugs/1816240

Title:
  Impossible to boot 18.04.2 from btrfs

Status in ubiquity package in Ubuntu:
  Incomplete

Bug description:
  Try to install Xubuntu 18.04.2 on btrfs, it failed to boot because grub could not find the kernel.
  The partition did have two directories @ and @home, the @ one contained all the root files, while the @home one contained the 'user' directory.

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