Ich habe meinen Server von 14.04 auf 16.04 aktualisiert. Ich kann folgenden Fehler auf Syslog sehen:
ifup[478]: Internet Systems Consortium DHCP Client 4.2.4
ifup[478]: Copyright 2004-2012 Internet Systems Consortium.
ifup[478]: All rights reserved.
ifup[478]: For info, please visit https://www.isc.org/software/dhcp/
ifup[478]: Usage: dhclient [-4|-6] [-SNTP1dvrx] [-nw] [-p <port>] [-D LL|LLT]
ifup[478]: [-s server-addr] [-cf config-file] [-lf lease-file]
ifup[478]: [-pf pid-file] [--no-pid] [-e VAR=val]
ifup[478]: [-sf script-file] [interface]
ifup[478]: Failed to bring up eth0.
systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: Failed to start Raise network interfaces.
systemd[1]: networking.service: Unit entered failed state.
systemd[1]: networking.service: Failed with result 'exit-code'.
Ich erhalte auch den gleichen Fehler, wenn ich versuche, es manuell zu tun
# ifup --verbose eth0
Configuring interface eth0=eth0 (inet)
/bin/run-parts --exit-on-error --verbose /etc/network/if-pre-up.d
run-parts: executing /etc/network/if-pre-up.d/ethtool
run-parts: executing /etc/network/if-pre-up.d/wireless-tools
run-parts: executing /etc/network/if-pre-up.d/wpasupplicant
/sbin/dhclient -1 -v -pf /run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases -I -df /var/lib/dhcp/dhclient6.eth0.leases eth0
Usage: dhclient [-4|-6] [-SNTP1dvrx] [-nw] [-p <port>] [-D LL|LLT]
[-s server-addr] [-cf config-file] [-lf lease-file]
[-pf pid-file] [--no-pid] [-e VAR=val]
[-sf script-file] [interface]
Failed to bring up eth0.
Ich kann 8.8.8.8 pingen. Kann jedoch keine Domainnamen auflösen.
Was kann ich tun, um die Netzwerkverbindung wiederherzustellen?