Comment 6 for bug 1764246

I tried here with a Bionic VM (kernel 4.15.0-34) and kdump worked fine, using the default
config (128M reserved for the crash kernel).

I'll try to mimic the HW of Daniel's guest and perhaps the kernel version, although it's super old and seems not available anymore.

@Paul, perhaps worth for you to append "earlyprintk=ttyS0" to your kdump cmdline (assuming ttyS0 is your serial console output) in order to dump some messages while it boots.

Cheers,

Guilherme