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[mikelococo <1465322@xxxxxxxxxxxxxxxxxx>]

I'm not the original reporter, but I am affected and the fix looks good
to me. Details below (forgive any typos or abbreviations, copy/paste not
setup for my test-vm)...

### First boot
$ uname -r
3.2.0-86-generic
$uname -v
#124-Ubuntu SMP Wed Jun 17 <... snip build time ...>
$ df
df: '/sys/kernel/debug': Function not implemented # Error reproduced with build-124
<... snip ...>
$ echo 'deb http://archive.ubuntu.com/ubuntu/ trusty-proposed restricted main multiverse universe' > /etc/apt/sources.list
$ sudo aptitude update
<... snip ...>
$ sudo aptitude upgrade # installs build-125
<... snip ...>
$ sudo reboot

### Second boot
$ uname -r
3.2.0-86-generic
$ uname -v
#125-Ubuntu SMP Wed Jun 19 <... snip build time ...>
$ df
<... snip ...> # No error with build-125

** Tags removed: verification-needed-precise
** Tags added: verification-done-precise

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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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