Dear Linux users,
I was working in ubuntu 14.04. I have upgraded to 16.04 through terminal.After upgrading, internet is not working.
I have seen one major problem after upgrading. I have seen that terminal is showing that my ubuntu version is 16.04 while setting showing that version is 14.04.

Can anyone help me to sort out this problem so that I can use internet on new version?

Thanks.
Regards,

Summit

Check

in case eth0 or wlan0 changed over to eth1 or wlan1.

Hi...

In case the command suggested by rokytnji doesn't work, please post the results of...

If using a USB wireless adapter, use this command...

Please also include the results from...

If this is a laptop, please also include...

Regards...

Hello friends,
Thanks for reply!

Here is the output. I am using dell laptop.

root@AnimalPlanet:~# ifconfig -a
enp0s29u1u2c4i2 Link encap:Ethernet HWaddr 8a:53:95:b8:f6:55
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)

eth0 Link encap:Ethernet HWaddr f0:4d:a2:be:72:d6
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)

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:711 errors:0 dropped:0 overruns:0 frame:0
TX packets:711 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:59017 (59.0 KB) TX bytes:59017 (59.0 KB)

wlan0 Link encap:Ethernet HWaddr 8c:a9:82:07:63:7c
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)


root@AnimalPlanet:~# lspci -nnk | grep -i net -A2
12:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 1000 [Condor Peak] [8086:0083]
Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN [8086:1325]
Kernel driver in use: iwlwifi
--
13:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136] (rev 02)
Subsystem: Dell RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [1028:0447]
Kernel driver in use: r8169
Kernel modules: r8169

root@AnimalPlanet:~# lsmod
Module Size Used by
bnep 18895 2
bluetooth 342208 7 bnep
ipheth 13216 0
binfmt_misc 13140 1
arc4 12536 2
iwldvm 214950 0
mac80211 554291 1 iwldvm
snd_hda_codec_hdmi 45440 1
snd_hda_codec_idt 53340 1
snd_hda_intel 42858 5
snd_hda_codec 168250 3 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep 13272 1 snd_hda_codec
snd_pcm 85501 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
uvcvideo 71309 0
snd_page_alloc 14230 2 snd_pcm,snd_hda_intel
videobuf2_vmalloc 13048 1 uvcvideo
videobuf2_memops 13170 1 videobuf2_vmalloc
snd_seq_midi 13132 0
snd_seq_midi_event 14475 1 snd_seq_midi
snd_rawmidi 25543 1 snd_seq_midi
snd_seq 55431 2 snd_seq_midi_event,snd_seq_midi
intel_powerclamp 14239 0
snd_seq_device 14137 3 snd_seq,snd_rawmidi,snd_seq_midi
dell_wmi 12665 0
videobuf2_core 39258 1 uvcvideo
dell_laptop 17781 0
sparse_keymap 13708 1 dell_wmi
videodev 108503 2 uvcvideo,videobuf2_core
coretemp 13195 0
dcdbas 14448 1 dell_laptop
kvm_intel 132651 0
snd_timer 28569 2 snd_pcm,snd_seq
iwlwifi 156145 1 iwldvm
snd 60939 21 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,s nd_hda_intel,snd_seq_device,snd_seq_midi
soundcore 12600 1 snd
kvm 388316 1 kvm_intel
joydev 17101 0
cfg80211 417586 3 iwlwifi,mac80211,iwldvm
serio_raw 13230 0
mei_me 18195 0
mei 66737 1 mei_me
lpc_ich 16864 0
shpchp 32128 0
mac_hid 13037 0
parport_pc 31981 0
ppdev 17391 0
lp 13299 0
parport 40836 3 lp,ppdev,parport_pc
autofs4 33269 2
hid_generic 12492 0
usbhid 47070 0
hid 87604 2 hid_generic,usbhid
radeon 1425038 3
i2c_algo_bit 13197 1 radeon
ttm 85079 1 radeon
drm_kms_helper 48868 1 radeon
ahci 25643 6
psmouse 95439 0
drm 244037 5 ttm,drm_kms_helper,radeon
libahci 27214 1 ahci
r8169 61562 0
intel_ips 18217 0
mii 13654 1 r8169
wmi 18673 1 dell_wmi
video 18903 0

root@AnimalPlanet:~# iwconfig
enp0s29u1u2c4i2 no wireless extensions.

wlan0 IEEE 802.11bgn ESSIDff/any
Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry long limit:7 RTS thrff Fragment thrff
Encryption keyff
Power Managementff

lo no wireless extensions.

eth0 no wireless extensions.

root@AnimalPlanet:~# rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no


I have dual boot (windows+ubuntu). In windows, internet is working properly but in ubuntu, it is not working. Even it is showing two different versions as posted previously.

Thanks.
Regards,
Summit

None of your wired NICs got any IPs at all. Do they get IPs via networkmanager?. Make sure that the correct interface is configured there. Some distros have different naming schemes for NICs (ie enp0Sxx for eth0). Check that name as well and if it's been changed then modify the config accordingly.

Everything looks OK as far as hardware being recognised and names being correct.

eg: wlan0 and eth0

Like c0wb0y said. Maybe the network manager application is mis-configured after your distro upgrade.

Edit: I mention this. Because in my experience.
Sometimes the package maintainers configuration text files over ride your install configuration files. So you have to start over from the beginning on connecting.

I run Debian with Window managers myself. I use WICD instead of Network Manager for a graphic connection wizard. So I am not much help on troubleshooting network manager.

So this might help , or not.

link

Maybe you will get better luck with your search terms than I did.

Hi friends,

I have also tried WICD but it's not working.
Any have solution to my problem?

Thanks.
Summit.

Hi...

Did you look through c0wb0y's suggestion above?

Regards...