Hallo praseodym,
danke für deine Antwort, hier die Ausgaben. Ich hoffe, es ist alles korrekt, musste die Ausgaben von meinem Haupt-PC (der mit dem Netz-Problem) auf meinen Zweit-PC (mit dem ich hier drin bin) übertragen.
~$ uname -a
linuxpc 4.18.0-25-generic #26~18.04.1-Ubuntu SMP Thu Jun 27 07:28:31 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
~$ lspci -nnk | grep -i net -A2
08:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM43142 802.11b/g/n [14e4:4365] (rev 01)
Subsystem: Hewlett-Packard Company BCM43142 802.11b/g/n [103c:2230]
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [103c:228d]
Kernel driver in use: r8169
Kernel modules: r8169
pccardctl info → keine Ausgabe
~$ lsusb
Bus 001 Device 005: ID 0a5c:216c Broadcom Corp. BCM43142A0 Bluetooth Device
Bus 001 Device 004: ID 138a:0050 Validity Sensors, Inc. Swipe Fingerprint Sensor
Bus 001 Device 003: ID 0bda:5775 Realtek Semiconductor Corp. HP "Truevision HD" laptop camera
Bus 001 Device 002: ID 8087:8000 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 004: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
Bus 002 Device 007: ID 18a5:0302 Verbatim, Ltd Flash Drive
Bus 002 Device 006: ID 046a:0023 Cherry GmbH CyMotion Master Linux Keyboard G230
Bus 002 Device 005: ID 0424:2228 Standard Microsystems Corp. 9-in-2 Card Reader
Bus 002 Device 003: ID 0424:2602 Standard Microsystems Corp. USB 2.0 Hub
Bus 002 Device 002: ID 0424:2512 Standard Microsystems Corp. USB 2.0 Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eno1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
link/ether 6c:c2:17:6d:37:f6 brd ff:ff:ff:ff:ff:ff
~$ ip -4 addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
ip -4 route, ip -4 neigh → keine Ausgabe
~$ nmcli general
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
disconnected unknown enabled disabled enabled disabled
~$ nmcli device
DEVICE TYPE STATE CONNECTION
eno1 ethernet unavailable --
lo loopback unmanaged --
~$ nmcli connection
NAME UUID TYPE DEVICE
Wired connection 1 0bf4efb2-e579-3e85-9871-a3d820f7fc7d ethernet --
~$ ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 39 Jun 10 20:43 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf
~$ cat /etc/resolv.conf
# This file is managed by man:systemd-resolved(8). Do not edit.
#
# This is a dynamic resolv.conf file for connecting local clients to the
# internal DNS stub resolver of systemd-resolved. This file lists all
# configured search domains.
#
# Run "systemd-resolve --status" to see details about the uplink DNS servers
# currently in use.
#
# Third party programs must not access this file directly, but only through the
# symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a different way,
# replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.
nameserver 127.0.0.53
options edns0
~$ cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 linuxpc
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
~$ sudo ss -pan 'sport = 53'
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
udp UNCONN 0 0 127.0.0.53%lo:53 0.0.0.0:* users:(("systemd-resolve",pid=791,fd=12))
tcp LISTEN 0 128 127.0.0.53%lo:53 0.0.0.0:* users:(("systemd-resolve",pid=791,fd=13))
ping -c 2 $(ip -4 route show default | grep -o '[0-9]*[.][.0-9]*' ) → liefert Syntaxfehler
~$ ping -c 2 213.95.41.4
connect: Network is unreachable
~$ ping -c 2 www.ubuntuusers.de
ping: www.ubuntuusers.de: Temporary failure in name resolution
Gruss
anick