$ 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/md1 17444128 13637124 2927852 83% / udev 950040 4 950036 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/md1 17444128 13638268 2926708 83% / udev 950040 4 950036 1% /dev
This is confirmed in an amd64 VM and on an amd64 system.
$ cat /proc/version_ signature 121-generic 3.2.68
Ubuntu 3.2.0-84.
$ df | head -3
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md1 17444128 13637124 2927852 83% /
udev 950040 4 950036 1% /dev
$ cat /proc/version_ signature 122-generic 3.2.69
Ubuntu 3.2.0-85.
$ df | head -3 debug': Function not implemented
df: `/sys/kernel/
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md1 17444128 13638268 2926708 83% /
udev 950040 4 950036 1% /dev
This is confirmed in an amd64 VM and on an amd64 system.