I tested the initramfs-tools in xenial-proposed, bionic-proposed, and 
disco-proposed with all 3 testcases (panic=-1, panic=10, and no panic), 
everything worked as expected:
- panic=-1 rebooted instantly after the root partition is not found
- panic=10 rebooted after 10 seconds
- no "panic" entry caused to drop into a basic shell

ii  initramfs-tools  0.122ubuntu8.16  all  generic modular initramfs generator 
(automation)
ii  initramfs-tools  0.130ubuntu3.9   all  generic modular initramfs generator 
(automation)
ii  initramfs-tools  0.131ubuntu19.2  all  generic modular initramfs generator 
(automation)


multipass@xenial:~$ apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.122ubuntu8.16
  Candidate: 0.122ubuntu8.16
  Version table:
 *** 0.122ubuntu8.16 400
        400 http://archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     0.122ubuntu8.15 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
     0.122ubuntu8.14 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
     0.122ubuntu8 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages


multipass@bionic:~$ apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.130ubuntu3.9
  Candidate: 0.130ubuntu3.9
  Version table:
 *** 0.130ubuntu3.9 400
        400 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     0.130ubuntu3.8 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
     0.130ubuntu3.6 500
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
     0.130ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages


multipass@disco:~$ apt-cache policy initramfs-tools
initramfs-tools:
  Installed: 0.131ubuntu19.2
  Candidate: 0.131ubuntu19.2
  Version table:
 *** 0.131ubuntu19.2 400
        400 http://archive.ubuntu.com/ubuntu disco-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     0.131ubuntu19.1 500
        500 http://archive.ubuntu.com/ubuntu disco-updates/main amd64 Packages
     0.131ubuntu19 500
        500 http://archive.ubuntu.com/ubuntu disco/main amd64 Packages

** Tags removed: verification-needed verification-needed-bionic 
verification-needed-disco verification-needed-xenial
** Tags added: verification-done-bionic verification-done-disco 
verification-done-xenial

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https://bugs.launchpad.net/bugs/1831252

Title:
  panic=-1 is completely ignored by the initrd causing unexpected
  behaviour

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