So, everything done was correct, aside from generating the initrd image.
The one at /boot/ is used for booting. For crashing, it's used the one
from /var/lib/kdump/. You should remove it and reload kdump:
rm /var/lib/kdump/initrd.img-`uname -r`
kdump-config reload
** Changed in: makedumpfile (Ubuntu Groovy)
Status: New => Invalid
** Changed in: makedumpfile (Ubuntu Focal)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1875826
Title:
Kdumping on an Ubuntu 20.04 guest with an encrypted root partition
drops user to initramfs console
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