ver_linux 

If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux laptop 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
 
Gnu C                  4.6.1
Gnu make               3.81
binutils               2.21.53.20110810
util-linux             2.19.1
mount                  support
module-init-tools      3.16
e2fsprogs              1.41.14
pcmciautils            015
PPP                    2.4.5
Linux C Library        2.13
Dynamic linker (ldd)   2.13
Procps                 3.2.8
Net-tools              1.60
Kbd                    1.15.2
Sh-utils               8.5
wireless-tools         30
Modules Loaded         des_generic md4 rfcomm bnep vboxnetadp vboxnetflt vboxdrv parport_pc ppdev nls_utf8 binfmt_misc cifs dm_crypt nvidia snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm uvcvideo snd_seq_midi videodev snd_rawmidi snd_seq_midi_event btusb bluetooth snd_seq arc4 v4l2_compat_ioctl32 snd_timer joydev iwl4965 snd_seq_device iwl_legacy mac80211 pcmcia tifm_7xx1 snd cfg80211 soundcore psmouse serio_raw yenta_socket snd_page_alloc toshiba_bluetooth pcmcia_rsrc pcmcia_core sparse_keymap tifm_sd tifm_core lp parport vesafb usbhid hid sdhci_pci sdhci video firewire_ohci firewire_core crc_itu_t r8169