Comment 7 for bug 1831252

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