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

[BertN45]

WRAP UP

First my mistake:
I found a work-around. My 2008 HP dc5850 allows me to boot from the first disk of the internal SATA-2 controller or from a SATA-3 PCIe card, I have added for the SSD. I did boot in the BIOS from the SSD, but did forget all about it and assumed during the installation of Xubuntu with btrfs, that I was still booting from sda. That is where everything started to go wrong, since grub (SSD) still expected the previous ext4 system on that newly installed partition.

Second the remaining bug in update-grub.
I booted in the main system again and did run update-grub. Update-grub did not detect the btrfs system and left it out from the list of bootable system. So in my mind there was no way I could boot that just installed system and that resulted in this bug-report.

I'm lucky with the separate SATA-3 controller, because I can boot both
systems, but I have to select the btrfs system from the BIOS after any
update of one my three ext4 systems. During 'normal' operation I have to
select the boot entry for my main system manually. So it is important,
that update-grub is corrected for those people with a BIOS without drive
choice.

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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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