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Το θέμα επιλύθηκε ως εξής:
1.Σύνδεσα το καλώδιο δικτύου (ethernet) στο Laptop.
2. Έδωσα τις εντολές:
sudo ifconfig eth0 up
sudo dhclient eth0
3. Έκανα ενημέρωση λογισμικού με τις εντολές:
sudo apt-get update && sudo apt-get dist-upgrate
4. Έκανα επανεκκίνηση.
Όπου eth0 μπορεί να είναι άλλο όνομα ΕΤΗΕΡΝΕΤ κάρτας. (Υπάρχει πιθανότητα μεταονομασίας)

Έχω το desktop της υπογραφής και δεν είχα internet μετά από ψάξιμο sto /var/log/syslog είδα ότι ο network manager σκοτώνεται και το interface μεταονομάζεται από eth0 σε eth1.

Κώδικας: Επιλογή όλων

May 14 09:56:13 dimitris kernel: [ 15.336056] systemd-udevd[316]: renamed network interface eth0 to eth1
May 14 09:56:16 dimitris kernel: [ 20.090950] init: network-manager main process (1001) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.090956] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.096510] init: network-manager main process (1005) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.096519] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.106629] init: network-manager main process (1009) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.106636] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.115148] init: network-manager main process (1013) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.115156] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.125654] init: network-manager main process (1017) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.125661] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.134116] init: network-manager main process (1021) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.134124] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.144316] init: network-manager main process (1025) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.144324] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.157319] init: network-manager main process (1029) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.157327] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.164216] init: network-manager main process (1033) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.164223] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.176385] init: network-manager main process (1037) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.176392] init: network-manager main process ended, respawning
May 14 09:56:16 dimitris kernel: [ 20.183501] init: network-manager main process (1042) killed by SEGV signal
May 14 09:56:16 dimitris kernel: [ 20.183508] init: network-manager respawning too fast, stopped
May 14 10:19:42 dimitris kernel: [ 14.544540] systemd-udevd[332]: renamed network interface eth0 to eth1
May 14 10:19:43 dimitris kernel: [ 18.510449] init: network-manager main process (1010) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.510456] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.516043] init: network-manager main process (1014) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.516050] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.522055] init: network-manager main process (1018) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.522061] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.528298] init: network-manager main process (1022) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.528305] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.533757] init: network-manager main process (1026) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.533763] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.542704] init: network-manager main process (1032) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.542711] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.549678] init: network-manager main process (1036) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.549686] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.556664] init: network-manager main process (1040) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.556671] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.563822] init: network-manager main process (1044) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.563829] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.571314] init: network-manager main process (1048) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.571321] init: network-manager main process ended, respawning
May 14 10:19:43 dimitris kernel: [ 18.578454] init: network-manager main process (1052) killed by SEGV signal
May 14 10:19:43 dimitris kernel: [ 18.578461] init: network-manager respawning too fast, stopped


Έτσι δοκίμασα να βάλω τις γραμμές στο την κάτάλληλη εγγραφή στο /etc/network/interfaces

Κώδικας: Επιλογή όλων


auto eth1
iface eth1 inet dhcp


Και είτε δώσω

Κώδικας: Επιλογή όλων

sudo /etc/init.d/networking restart


Είτε κάνω restart internet γιοκ

Χαρακτηριστικό είναι ότι στα logs είδα το εξής:

Κώδικας: Επιλογή όλων

pcmagas@dimitris:~$ cat /var/log/syslog | grep "network" | tail
May 14 10:43:31 dimitris kernel: [ 334.100411] init: network-manager respawning too fast, stopped
May 14 10:49:30 dimitris kernel: [ 14.668333] systemd-udevd[319]: renamed network interface eth0 to eth1
May 14 10:49:30 dimitris kernel: [ 14.894518] init: network-interface (lo) pre-start process (457) terminated with status 1
May 14 10:49:30 dimitris kernel: [ 14.898065] init: network-interface (lo) post-stop process (478) terminated with status 1
May 14 10:49:30 dimitris kernel: [ 14.968791] init: network-interface (eth1) pre-start process (561) terminated with status 1
May 14 10:49:30 dimitris kernel: [ 14.970791] init: network-interface (eth1) post-stop process (566) terminated with status 1
May 14 10:49:30 dimitris kernel: [ 16.484382] init: networking pre-start process (674) terminated with status 1
May 14 10:49:30 dimitris kernel: [ 16.552255] init: networking post-stop process (680) terminated with status 100
May 14 10:51:30 dimitris kernel: [ 137.368655] init: networking pre-start process (1117) terminated with status 1
May 14 10:51:30 dimitris kernel: [ 137.395980] init: networking post-stop process (1131) terminated with status 100

Ακόμη μερικές διευκρινιστικές εντολές:

Κώδικας: Επιλογή όλων

pcmagas@dimitris:/media/pcmagas/Backup$ lshw -c NET
ΠΡΟΕΙΔΟΠΟΙΗΣΗ: πρέπει να τρέξετε αυτό το πρόγραμμα σαν υπερχρήστης.
*-network DISABLED
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
κατασκευαστής: Realtek Semiconductor Co., Ltd.
physical id: 0
πληροφορίες διαύλου: pci@0000:03:00.0
λογικό όνομα: eth1
version: 15
serial: 30:5a:3a:82:3c:2c
μέγεθος: 100Mbit/s
χωρητικότητα: 1Gbit/s
πλάτος: 64 bits
ρολόι: 33MHz
capabilities: bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full latency=0 link=no multicast=yes port=MII speed=100Mbit/s
πόροι: irq:123 ioport:d000(size=256) μνήμη:df104000-df104fff μνήμη:df100000-df103fff
WARNING: output may be incomplete or inaccurate, you should run this program as super-user.


lspci:

Κώδικας: Επιλογή όλων

00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA controller [AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1)
00:1c.7 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #8 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce GT 610] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

uname -a:

Κώδικας: Επιλογή όλων

Linux dimitris 4.2.0-36-generic #41~14.04.1-Ubuntu SMP Tue Apr 19 17:03:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

ifconfg -a:

Κώδικας: Επιλογή όλων

pcmagas@dimitris:~$ ifconfig -a
eth1 Link encap:Ethernet HWaddr 30:5a:3a:82:3c:2c
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:213 errors:0 dropped:0 overruns:0 frame:0
TX packets:213 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:27693 (27.6 KB) TX bytes:27693 (27.6 KB)


Τέλος να σημειώσω ότι ΔΕΝ βλέπω ούτε τον network indicator.