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

[Steve Langasek]

When this happens, it would be good to get the output of lsof for the
debconf frontend process as well as the whiptail process, to check where
stdin and stdout are connected.

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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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