Perhaps that is because I am well patched.

Anyway, 2.6.32 <= 2.6.37 (my kernel).

Beside, people are here have reported about their Ubuntu boxes which this exploit showed some success at there

    tzury@precision:/tmp$ uname -a
    Linux precision 2.6.32-26-generic #48-Ubuntu SMP Wed Nov 24 10:14:11 UTC 2010 x86_64 GNU/Linux
    tzury@precision:/tmp$ cat /etc/lsb-release 
    DISTRIB_ID=Ubuntu
    DISTRIB_RELEASE=10.04
    DISTRIB_CODENAME=lucid
    DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS"
    tzury@precision:/tmp$ gcc full-nelson.c -o full-nelson
    tzury@precision:/tmp$ ./full-nelson 
    [*] Resolving kernel addresses...
     [+] Resolved econet_ioctl to 0xffffffffa01815d0
     [+] Resolved econet_ops to 0xffffffffa01816c0
     [+] Resolved commit_creds to 0xffffffff8108aed0
     [+] Resolved prepare_kernel_cred to 0xffffffff8108b2b0
    [*] Calculating target...
    [*] Triggering payload...
    [*] Exploit failed to get root.