[Bug 1674532] Re: Ubuntu 14.04 broken during PXE boot

[thedarkwinter]

Hi

To extend the info on this one:

unattended-upgrades updated this package today, and caused the same
issue for me, causing servers to stop resolving DNS internally.
Rebooting after installing resolved the issue, suggesting the update
itself is fine, but the process of updating breaks resolution.

After updating a server (without reboot), the internal DNS servers
received odd queries of type TYPE20736 (no idea what that is)

21-Mar-2017 10:38:49.627 queries: info: client 172.16.x.x#49803
(host.internal.domain): query: host.internal.domain IN TYPE20736 +
(172.16.x.x)

After rebooting said server, it starts querying normal type A records
again.

I also run some authoritative DNS servers, and have seen the same query
type from the public - suggesting that other servers out in the wild are
experiencing the same issue!

21-Mar-2017 14:22:22.578 queries: client x.x.x.x#43836 (www.domain.com):
query: www.domain.com IN TYPE20736 - (x.x.x.x)

I realize this is not directly related to the subject of this bug, but I
think its relevant.

Cheers,
Michael

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https://bugs.launchpad.net/bugs/1674532

Title:
  Ubuntu 14.04 broken during PXE boot

Status in eglibc package in Ubuntu:
  Confirmed

Bug description:
  After installing the libc6_2.19-0ubuntu6.10_amd64_udeb package during
  the automated install of ubuntu 14.04.5, the system was suddenly
  unable to resolve hostnames via dns. Installing -0ubuntu6.9 resolved
  the issue. Reinstalling -ubuntu6.10 broke the system again.

  I note that -ubuntu6.10 was recently added to the archive.

  I am currently unable to install Ubuntu 14.04.5.

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