networking - Using the internet causes my computer to crash - Ask Ubuntu

i have installed ubuntu 16.04 on machine when disconnect ethernet cable works fine if connected , turn computer on (it gets logon screen) freezes , caps locks , scroll lock light start blinking.

if reconnect ethernet cable after logging on not freeze until either open software centre start fire fox or ping google in terminal- start receive data before crashing.

note: have 32 bit version of elementary os 32 bit (which based of ubuntu 12.04) on different partition , internet works fine.

edit:
hav insalled ubuntu 16.04

system specs:

cpu: quad-core intel® core™2 quad cpu q6700 @ 2.66ghz ram: 4 gb   gpu: nvidia corporation g84 [geforce 8600 gt] (rev a1) 

output of lshw | grep eth -n10

 vendor: nvidia corporation 666-             physical id: 10.1 667-             bus info: pci@0000:00:10.1 668-             version: a2 669-             width: 32 bits 670-             clock: 66mhz 671-             capabilities: pm msi ht bus_master cap_list 672-             configuration: driver=snd_hda_intel latency=0 maxlatency=5 mingnt=2 673-             resources: irq:22 memory:f9efc000-f9efffff 674-        *-bridge 675:             description: ethernet interface 676:             product: mcp51 ethernet controller 677-             vendor: nvidia corporation 678-             physical id: 14 679-             bus info: pci@0000:00:14.0 680-             logical name: enp0s20 681-             version: a3 682-             serial: 00:19:66:78:2b:ec 683-             size: 100000000 684-             capacity: 1000000000 685-             width: 32 bits 686-             clock: 66mhz -- 818-                   logical name: / 819-                   capacity: 83gib 820-                   configuration: mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,data=ordered state=mounted 821-              *-logicalvolume:1 822-                   description: linux swap / solaris partition 823-                   physical id: 6 824-                   logical name: /dev/sdc6 825-                   capacity: 4094mib 826-                   capabilities: nofs 827-  *-network 828:       description: ethernet interface 829-       physical id: 1 830-       logical name: enx00051bbb8d01 831-       serial: 00:05:1b:bb:8d:01 832-       size: 10mbit/s 833-       capacity: 100mbit/s 834-       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation 835-       configuration: autonegotiation=on broadcast=yes driver=pegasus driverversion=v0.9.3 (2013/04/25) duplex=half link=no multicast=yes port=mii speed=10mbit/s