This bug was fixed in the package initramfs-tools - 0.122ubuntu8.16
--------------- initramfs-tools (0.122ubuntu8.16) xenial; urgency=medium
* Add support for panic=-1 value (LP: #1831252)
-- Julian Andres Klode <email address hidden> Mon, 07 Oct 2019 12:53:35 +0200
This bug was fixed in the package initramfs-tools - 0.122ubuntu8.16
---------------
initramfs-tools (0.122ubuntu8.16) xenial; urgency=medium
* Add support for panic=-1 value (LP: #1831252)
-- Julian Andres Klode <email address hidden> Mon, 07 Oct 2019 12:53:35 +0200