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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1574933

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1574933

Title:
  Big uploads blocked when upgrading from 14.04 to 16.04 -- TCP MTU
  Discovery not properly set.

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After upgrading 14.04 to 16.04 I couldn't send big emails with
  attachments, I couldn't use google drive. Sometimes lowering the MTU
  worked.

  I was able to get uploading of large files working again by playing
  with MTU probing and discovery:

  echo 1 > /proc/sys/net/ipv4/tcp_mtu_probing
  echo 1024 > /proc/sys/net/ipv4/tcp_base_mss

  Basic MTU related issues should be setup by default, perhaps
  interfaces need to updated during upgrade?

  Ubuntu 4.4.0-21.37-generic 4.4.6

  Without enabling tcp_mtu_probling I couldn't upload large files over
  HTTPS and SMTP w/ TLS.

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