So heute morgen hat es geklappt. Vielen Dank.
TravelMate-B116-M:~$ sudo lsmod
Module Size Used by
bnep 20480 2
joydev 20480 0
hid_multitouch 20480 0
acer_wmi 20480 0
sparse_keymap 16384 1 acer_wmi
intel_rapl 20480 0
intel_powerclamp 16384 0
coretemp 16384 0
kvm_intel 172032 0
kvm 536576 1 kvm_intel
irqbypass 16384 1 kvm
punit_atom_debug 16384 0
crct10dif_pclmul 16384 0
crc32_pclmul 16384 0
aesni_intel 167936 0
aes_x86_64 20480 1 aesni_intel
lrw 16384 1 aesni_intel
gf128mul 16384 1 lrw
glue_helper 16384 1 aesni_intel
ablk_helper 16384 1 aesni_intel
nls_iso8859_1 16384 1
cryptd 20480 2 aesni_intel,ablk_helper
arc4 16384 2
ath9k 143360 0
uvcvideo 90112 0
ath9k_common 36864 1 ath9k
videobuf2_vmalloc 16384 1 uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_v4l2 28672 1 uvcvideo
videobuf2_core 36864 2 uvcvideo,videobuf2_v4l2
input_leds 16384 0
ath3k 20480 0
ath9k_hw 466944 2 ath9k_common,ath9k
v4l2_common 16384 1 videobuf2_v4l2
btusb 45056 0
videodev 176128 4 uvcvideo,v4l2_common,videobuf2_core,videobuf2_v4l2
serio_raw 16384 0
ath 32768 3 ath9k_common,ath9k,ath9k_hw
btrtl 16384 1 btusb
media 24576 2 uvcvideo,videodev
mac80211 737280 1 ath9k
btbcm 16384 1 btusb
snd_hda_codec_hdmi 53248 1
btintel 16384 1 btusb
bluetooth 520192 10 bnep,ath3k,btbcm,btrtl,btusb,btintel
snd_hda_codec_realtek 86016 1
snd_hda_codec_generic 77824 1 snd_hda_codec_realtek
cfg80211 565248 4 ath,ath9k_common,ath9k,mac80211
lpc_ich 24576 0
snd_hda_intel 36864 3
snd_hda_codec 135168 4 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel
snd_hda_core 73728 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
snd_hwdep 16384 1 snd_hda_codec
snd_pcm 106496 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_core
dell_smo8800 16384 0
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 32768 2 snd_pcm,snd_seq
dw_dmac 16384 0
dw_dmac_core 24576 1 dw_dmac
i2c_designware_platform 16384 0
i2c_designware_core 20480 1 i2c_designware_platform
snd 81920 17 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
tpm_crb 16384 0
soc_button_array 16384 0
mei_txe 20480 0
int3400_thermal 16384 0
acpi_thermal_rel 16384 1 int3400_thermal
soundcore 16384 1 snd
mei 98304 1 mei_txe
shpchp 36864 0
int3403_thermal 16384 0
processor_thermal_device 16384 0
int340x_thermal_zone 16384 2 processor_thermal_device,int3403_thermal
intel_soc_dts_iosf 16384 1 processor_thermal_device
mac_hid 16384 0
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,ppdev,parport_pc
autofs4 40960 2
mmc_block 36864 4
r8168 495616 0
i915 1208320 7
i2c_algo_bit 16384 1 i915
drm_kms_helper 147456 1 i915
syscopyarea 16384 1 drm_kms_helper
i2c_hid 20480 0
hid 118784 2 i2c_hid,hid_multitouch
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
wmi 20480 1 acer_wmi
video 40960 2 i915,acer_wmi
sdhci_acpi 16384 0
sdhci 45056 1 sdhci_acpi
fb_sys_fops 16384 1 drm_kms_helper
drm 360448 8 i915,drm_kms_helper
fjes 28672 0
pinctrl_cherryview 32768 4
TravelMate-B116-M:~$ ifconfig -a
enp3s0 Link encap:Ethernet Hardware Adresse 54:ab:3a:2e:ca:5d
inet Adresse:78.34.21.246 Bcast:78.34.31.255 Maske:255.255.224.0
inet6-Adresse: fe80::ba07:3313:4fe8:1458/64 Gültigkeitsbereich:Verbindung
UP BROADCAST RUNNING MULTICAST MTU:1500 Metrik:1
RX-Pakete:9536 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
TX-Pakete:6643 Fehler:0 Verloren:0 Überläufe:0 Träger:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:9504011 (9.5 MB) TX-Bytes:908172 (908.1 KB)
Interrupt:196 Basisadresse:0x4000
lo Link encap:Lokale Schleife
inet Adresse:127.0.0.1 Maske:255.0.0.0
inet6-Adresse: ::1/128 Gültigkeitsbereich:Maschine
UP LOOPBACK RUNNING MTU:65536 Metrik:1
RX-Pakete:1379 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
TX-Pakete:1379 Fehler:0 Verloren:0 Überläufe:0 Träger:0
Kollisionen:0 Sendewarteschlangenlänge:1
RX-Bytes:127929 (127.9 KB) TX-Bytes:127929 (127.9 KB)
wlp2s0 Link encap:Ethernet Hardware Adresse a8:a7:95:92:98:67
BROADCAST MULTICAST MTU:1500 Metrik:1
RX-Pakete:0 Fehler:0 Verloren:0 Überläufe:0 Fenster:0
TX-Pakete:0 Fehler:0 Verloren:0 Überläufe:0 Träger:0
Kollisionen:0 Sendewarteschlangenlänge:1000
RX-Bytes:0 (0.0 B) TX-Bytes:0 (0.0 B)
TravelMate-B116-M:~$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search netcologne.de
TravelMate-B116-M:~$ dmesg | grep r8
[ 0.000000] PERCPU: Embedded 33 pages/cpu @ffff88017fc00000 s98008 r8192 d28968 u524288
[ 0.000000] pcpu-alloc: s98008 r8192 d28968 u524288 alloc=1*2097152
[ 2.952050] r8168: module verification failed: signature and/or required key missing - tainting kernel
[ 2.952759] r8168 Gigabit Ethernet driver 8.043.02-NAPI loaded
[ 2.974251] r8168: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.
[ 2.974267] r8168 Copyright (C) 2016 Realtek NIC software team <nicfae@realtek.com>
[ 3.397913] r8168 0000:03:00.0 enp3s0: renamed from eth0
[ 22.100727] r8168: enp3s0: link up
[ 27.082491] r8168: enp3s0: link down
[ 50.125396] r8168: enp3s0: link up
[ 57.106474] r8168: enp3s0: link down
[ 80.124911] r8168: enp3s0: link up