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[mig5 <1465322@xxxxxxxxxxxxxxxxxx>]

After upgrading 12.04 machines to

 linux-image-3.2.0-86-generic    3.2.0-86.124

from

 linux-image-3.2.0-86-generic    3.2.0-86.123

.. I still continue to get the same 'function not implemented',
including after reboot.

For 12.04 machines running the Trusty HWE kernel 3.13.0-55-generic
#94~precise1-Ubuntu SMP, and Trusty machines themselves, the issue
appears resolved..

I wonder if it still affects machines on 3.2.0-86 *if* they had
previously upgraded to the regression kernel last week? I haven't tested
on a machine on 85->newest 86 yet.

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https://bugs.launchpad.net/bugs/1465322

Title:
  regression: "df: `/sys/kernel/debug': Function not implemented" with
  3.2.0-85.122

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Precise:
  Fix Committed

Bug description:
  $ cat /proc/version_signature
  Ubuntu 3.2.0-84.121-generic 3.2.68

  $ df | head -3
  Filesystem     1K-blocks    Used Available Use% Mounted on
  /dev/vda1        7481832 4262872   2838904  61% /
  udev              371920       4    371916   1% /dev

  $ cat /proc/version_signature
  Ubuntu 3.2.0-85.122-generic 3.2.69

  $ df | head -3
  df: `/sys/kernel/debug': Function not implemented
  Filesystem     1K-blocks    Used Available Use% Mounted on
  /dev/vda1        7481832 4263012   2838764  61% /
  udev              371920       4    371916   1% /dev

  This is confirmed in an amd64 VM and on an amd64 system. It doesn't
  make a difference if I use sudo.

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