If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.
 
Linux arch 4.1.20-1-lts #1 SMP Fri Mar 18 17:26:44 CET 2016 x86_64 GNU/Linux
 
GNU C			5.3.0
GNU Make		4.1
Binutils		2.26.0.20160302
Util-linux		2.27.1
Mount			2.27.1
Module-init-tools	22
E2fsprogs		1.42.13
Jfsutils		1.1.15
Reiserfsprogs		3.6.24
Xfsprogs		4.3.0
Pcmciautils		018
PPP			2.4.7
Linux C Library		2.23
Dynamic linker (ldd)	2.23
Linux C++ Library	6.0.21
Kbd			2.0.3
Console-tools		2.0.3
Sh-utils		8.25
Udev			229
Modules Loaded		8250_dw ablk_helper ac acpi_pad acpi_thermal_rel aesni_intel aes_x86_64 af_alg ahci algif_skcipher arc4 atkbd auth_rpcgss battery bridge button cdc_ether cdrom cfg80211 coretemp crc16 crc32c_intel crc32_pclmul crct10dif_pclmul cryptd dcdbas dell_laptop dell_led dell_smo8800 dell_wmi dm_crypt dm_mod drm drm_kms_helper dw_dmac dw_dmac_core e1000e ehci_hcd ehci_pci evdev ext4 fan fat fscache fuse gf128mul glue_helper gpio_lynxpoint grace hid i2c_algo_bit i2c_designware_core i2c_designware_platform i2c_hid i2c_i801 i8042 i8k i915 int3400_thermal int3402_thermal int3403_thermal int340x_thermal_zone intel_gtt intel_powerclamp intel_rapl iosf_mbi ip_tables iTCO_vendor_support iTCO_wdt iwlmvm iwlwifi jbd2 joydev kvm kvm_intel led_class libahci libata libps2 llc lockd lpc_ich lrw mac80211 mac_hid macvlan macvtap mbcache media mei mei_me mii mmc_core mousedev nfs nfs_acl nfsd nls_cp437 nls_iso8859_1 oid_registry parport parport_pc ppdev pps_core processor processor_thermal_device psmouse ptp regmap_i2c rfkill rndis_host sch_fq_codel scsi_mod sdhci sdhci_acpi sdhci_pci sd_mod serio serio_raw shpchp snd snd_compress snd_hda_codec snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_controller snd_hda_core snd_hda_intel snd_hwdep snd_pcm snd_pcm_dmaengine snd_soc_core snd_soc_rl6231 snd_soc_rt5640 snd_soc_sst_acpi snd_timer soundcore sparse_keymap spi_pxa2xx_platform sr_mod stp sunrpc thermal tun uas usb_common usbcore usbnet usb_storage uvcvideo v4l2_common vfat vhost vhost_net video videobuf2_core videobuf2_memops videobuf2_vmalloc videodev wmi x86_pkg_temp_thermal xhci_hcd xhci_pci x_tables