I dug into the source and dependencies, and this seems most likely due
to libuv1, which checks /proc/version_signature in uv__kernel_version()
in noble and later. That would explain why this did not show up for
jammy. I'm not sure if this really causes any issues for named, but it
still seems reasonable to allow it to read the kernel version info.

** Also affects: bind9 (Ubuntu Questing)
   Importance: Undecided
     Assignee: Lena Voytek (lvoytek)
       Status: Triaged

** Also affects: bind9 (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: bind9 (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Changed in: bind9 (Ubuntu Noble)
       Status: New => Triaged

** Changed in: bind9 (Ubuntu Plucky)
       Status: New => Triaged

** Changed in: bind9 (Ubuntu Noble)
     Assignee: (unassigned) => Lena Voytek (lvoytek)

** Changed in: bind9 (Ubuntu Plucky)
     Assignee: (unassigned) => Lena Voytek (lvoytek)

** Changed in: bind9 (Ubuntu Noble)
   Importance: Undecided => Wishlist

** Changed in: bind9 (Ubuntu Noble)
   Importance: Wishlist => Low

** Changed in: bind9 (Ubuntu Plucky)
   Importance: Undecided => Low

** Changed in: bind9 (Ubuntu Questing)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/2119320

Title:
  apparmor error opening /proc/version_signature

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