Does the machine boot if you select 4.15.0-33 from the GRUB menu? If so, can you test the latest 4.15 upstream stable kernel, which can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.18/
Does the machine boot if you select 4.15.0-33 from the GRUB menu? If so, can you test the latest 4.15 upstream stable kernel, which can be downloaded from:
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.15.18/