[Bug 1827697] [NEW] Enroll key whiptail prompt blocks kernel header package upgrades

[林博仁(Buo-ren, Lin)]

Public bug reported:

I noticed that sometimes the system upgrade is blocked in the kernel
header package's configure phase, in the process manager I found that it
is blocked by the "Configuring Secure Boot" whiptail prompt started by
`update-secureboot-policy --enroll-key` which doesn't surface to the
terminal and hence not interactable.

Refer the attached screenshot for the process status at the time.

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "process status"
   https://bugs.launchpad.net/bugs/1827697/+attachment/5261425/+files/Screenshot_20190504_143054.png

** Description changed:

  I noticed that sometimes the system upgrade is blocked in the kernel
  header package's configure phase, in the process manager I found that it
- is blocked by the "Configuring Secure Boot" whiptail prompt which
- doesn't surface to the terminal and hence not intractable.
+ is blocked by the "Configuring Secure Boot" whiptail prompt started by
+ `update-secureboot-policy --enroll-key` which doesn't surface to the
+ terminal and hence not intractable.
  
  Refer the attached screenshot for the process status at the time.

** Description changed:

  I noticed that sometimes the system upgrade is blocked in the kernel
  header package's configure phase, in the process manager I found that it
  is blocked by the "Configuring Secure Boot" whiptail prompt started by
  `update-secureboot-policy --enroll-key` which doesn't surface to the
- terminal and hence not intractable.
+ terminal and hence not interactable.
  
  Refer the attached screenshot for the process status at the time.

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https://bugs.launchpad.net/bugs/1827697

Title:
  Enroll key whiptail prompt blocks kernel header package upgrades

Status in shim-signed package in Ubuntu:
  New

Bug description:
  I noticed that sometimes the system upgrade is blocked in the kernel
  header package's configure phase, in the process manager I found that
  it is blocked by the "Configuring Secure Boot" whiptail prompt started
  by `update-secureboot-policy --enroll-key` which doesn't surface to
  the terminal and hence not interactable.

  Refer the attached screenshot for the process status at the time.

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