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[Agesp Anonymous <1465322@xxxxxxxxxxxxxxxxxx>]

Please note, does this bug affect any other software but just df command?
(definitely kernel related, after update from 3.2.0-84 to 3.2.0-86)

My setup is also affected by this bug:

$ df -h
df: ”/sys/kernel/debug”: Funktion toteutus puuttuu
Tiedostojärjestelmä  Koko  Käyt Vapaa Käy% Liitospiste
/dev/sda1             22G  4,2G   16G  21% /
...

$ LANG=C  df -h
df: `/sys/kernel/debug': Function not implemented
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        22G  4.2G   16G  21% /
...

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.5 LTS"

$ uname -a
Linux machine 3.2.0-86-generic-pae #123-Ubuntu SMP Sun Jun 14 18:30:54 UTC 2015 i686 athlon i386 GNU/Linux

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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

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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