Browsing the list of ESPHome components I noticed a
picture that looked very familiar. In my house I have this device
branded as "Joule" and
labeled "DeltaSolⓇ BS HE" and on ESPHome site they show "Resol DeltaSolⓇ BS
Plus": 
Connecting DeltaSol controller to Home Assistant with ESPHome
Installing Ubuntu userland with FreeBSD Linux Binary Compatibility
This topic is generally well documented in the relevant part of the FreeBSD Handbook Chapter 12. Except for a small detail which becomes important in certain configurations.
Grub does not recognize ext4 partition with certain features enabled
I was recently installing Arch Linux in a VM
following my own notes which are a simplified and shortened version of
official instructions.
The same procedure clearly worked approximately 6 months ago but for some
unknown reason now the new system would not boot and would instead drop into
Grub prompt. It turned out that Grub was not able to read ext4 filesystem
produced with the recent mkfs.ext4 command.