I got this result from your commands, more details in the next comment
with journalctl lines relevant to this:
sudo systemctl status network-pre.target networking.service network.target
ifup@eth0.service
● network-pre.target - Network (Pre)
Loaded: loaded (/lib/systemd/system/network-pre.target; static; vendor
preset: enabled)
Active: inactive (dead)
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● networking.service - LSB: Raise network interfaces.
Loaded: loaded (/etc/init.d/networking)
Drop-In: /run/systemd/generator/networking.service.d
└─50-insserv.conf-$network.conf
/lib/systemd/system/networking.service.d
└─network-pre.conf
Active: active (exited) since Wed 2015-02-11 13:26:25 EST; 55s ago
Docs: man:systemd-sysv-generator(8)
Process: 1214 ExecStart=/etc/init.d/networking start (code=exited,
status=0/SUCCESS)
Feb 11 13:26:25 ubuntu networking[1214]: * Configuring network interfaces...
Feb 11 13:26:25 ubuntu networking[1214]: /etc/resolvconf/update.d/libc: Warn...f
Feb 11 13:26:25 ubuntu networking[1214]: ...done.
● network.target - Network
Loaded: loaded (/lib/systemd/system/network.target; static; vendor preset:
enabled)
Active: active since Wed 2015-02-11 13:26:26 EST; 54s ago
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● ifup@eth0.service - ifup for eth0
Loaded: loaded (/lib/systemd/system/ifup@.service; static; vendor preset:
enabled)
Active: inactive (dead)
Feb 11 13:27:21 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14] T...g.
Hint: Some lines were ellipsized, use -l to show in full.
luke@ubuntu:~$ sudo systemctl status -l network-pre.target networking.service
network.target ifup@eth0.service
● network-pre.target - Network (Pre)
Loaded: loaded (/lib/systemd/system/network-pre.target; static; vendor
preset: enabled)
Active: inactive (dead)
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● networking.service - LSB: Raise network interfaces.
Loaded: loaded (/etc/init.d/networking)
Drop-In: /run/systemd/generator/networking.service.d
└─50-insserv.conf-$network.conf
/lib/systemd/system/networking.service.d
└─network-pre.conf
Active: active (exited) since Wed 2015-02-11 13:26:25 EST; 1min 35s ago
Docs: man:systemd-sysv-generator(8)
Process: 1214 ExecStart=/etc/init.d/networking start (code=exited,
status=0/SUCCESS)
Feb 11 13:26:25 ubuntu networking[1214]: * Configuring network interfaces...
Feb 11 13:26:25 ubuntu networking[1214]: /etc/resolvconf/update.d/libc:
Warning: /etc/resolv.conf is not a symbolic link to /run/resolvconf/resolv.conf
Feb 11 13:26:25 ubuntu networking[1214]: ...done.
● network.target - Network
Loaded: loaded (/lib/systemd/system/network.target; static; vendor preset:
enabled)
Active: active since Wed 2015-02-11 13:26:26 EST; 1min 35s ago
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● ifup@eth0.service - ifup for eth0
Loaded: loaded (/lib/systemd/system/ifup@.service; static; vendor preset:
enabled)
Active: inactive (dead)
Feb 11 13:27:21 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14]
Trailing garbage, ignoring.
Feb 11 13:28:01 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14]
Trailing garbage, ignoring.
luke@ubuntu:~$ sudo systemctl status network-pre.target networking.service
network.target ifup@eth0.service
● network-pre.target - Network (Pre)
Loaded: loaded (/lib/systemd/system/network-pre.target; static; vendor
preset: enabled)
Active: inactive (dead)
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● networking.service - LSB: Raise network interfaces.
Loaded: loaded (/etc/init.d/networking)
Drop-In: /run/systemd/generator/networking.service.d
└─50-insserv.conf-$network.conf
/lib/systemd/system/networking.service.d
└─network-pre.conf
Active: active (exited) since Wed 2015-02-11 13:26:25 EST; 1min 47s ago
Docs: man:systemd-sysv-generator(8)
Process: 1214 ExecStart=/etc/init.d/networking start (code=exited,
status=0/SUCCESS)
Feb 11 13:26:25 ubuntu networking[1214]: * Configuring network interfaces...
Feb 11 13:26:25 ubuntu networking[1214]: /etc/resolvconf/update.d/libc:
Warning: /etc/res...onf
Feb 11 13:26:25 ubuntu networking[1214]: ...done.
● network.target - Network
Loaded: loaded (/lib/systemd/system/network.target; static; vendor preset:
enabled)
Active: active since Wed 2015-02-11 13:26:26 EST; 1min 46s ago
Docs: man:systemd.special(7)
http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget
● ifup@eth0.service - ifup for eth0
Loaded: loaded (/lib/systemd/system/ifup@.service; static; vendor preset:
enabled)
Active: inactive (dead)
Feb 11 13:27:21 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14]
Trailing garbag...ng.
Feb 11 13:28:01 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14]
Trailing garbag...ng.
Feb 11 13:28:13 ubuntu systemd[1]: [/lib/systemd/system/ifup@.service:14]
Trailing garbag...ng.
Hint: Some lines were ellipsized, use -l to show in full.
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https://bugs.launchpad.net/bugs/1420601
Title:
Systemd_218-6ubuntu1 and later cannot connect to network except via
USB
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