[lubuntu] wifi connected but unable to use internet

i am able to connect to my wifi but there is no internet access.
and i am totally new to ubuntu.
here are some results
lspci -nnk | grep -iA2 net02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
Subsystem: Lenovo BCM43142 802.11b/g/n [17aa:0611]
Kernel driver in use: wl
--
03:00.0 Ethernet controller [0200]: Qualcomm Atheros QCA8172 Fast Ethernet [1969:10a0] (rev 10)
Subsystem: Lenovo QCA8172 Fast Ethernet [17aa:3801]
Kernel driver in use: alx
Kernel modules: alx

bestpain@bestpain-Lenovo-G510:~$ ifconfig
enp0s20u2 Link encap:Ethernet HWaddr 02:68:6c:79:74:04
inet addr:192.168.42.98 Bcast:192.168.42.255 Mask:255.255.255.0
inet6 addr: fe80::4449:b86b:2e69:c82b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:72814 errors:1 dropped:0 overruns:0 frame:1
TX packets:65574 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:77092214 (77.0 MB) TX bytes:9412753 (9.4 MB)

enp3s0 Link encap:Ethernet HWaddr 20:89:84:f5:34:5a
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:18

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:9798 errors:0 dropped:0 overruns:0 frame:0
TX packets:9798 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:1092615 (1.0 MB) TX bytes:1092615 (1.0 MB)

wlp2s0 Link encap:Ethernet HWaddr 1c:3e:84:ea:fb:91
inet addr:172.20.98.67 Bcast:172.20.255.255 Mask:255.255.0.0
inet6 addr: fe80::7287:4a42:835e:67a7/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5500 errors:0 dropped:0 overruns:0 frame:1204
TX packets:1344 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:532979 (532.9 KB) TX bytes:164811 (164.8 KB)
Interrupt:17

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[lubuntu] wifi connected but unable to use internet