[14:44] <jhg_> greetings
[14:53] <jhg_> I moved /boot (ext2) to / (ext4) in order to do kernel development on Ubuntu 16.04 kernel 4.4. I built/installed 4.18.0-rc1+ from source. The boot drops out to an (initramfs) shell because it cannot find the root lvm partition. /dev/mapper and /dev/disk/id are empty. 
[14:53] <jhg_> vgchange -ay has empty output, even after modprobe ext4
[15:12] <jhg_> I am going to try the ubuntu ppa 4.18.0-rc1 as a test.
[15:48] <jhg_> the ppa works... so I did something wrong with initrd. hmmm.
[16:00] <jhg_> the patches aren't relevant to me, so I am wondering what I missed. hmm... http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18-rc1/
[17:06] <tomreyn> you have /boot on an LVM LV? i wasn taware this works
[17:08] <tomreyn> oh rhgt, it's support, just discouraged for complexity
[17:08] <tomreyn> *supported