I am getting a similar message while booting and it takes like 30 seconds. The only differences is that on boot dhcpcd find's the working interface (eth0)* Bringing up interface eth0
* dhcp ...
* Running dhcpcd ...
dhcpcd[18704]: dhcpcd already running on pid 30298 (/var/run/dhcpcd-eth0.pid) [ !! ]
* ERROR: net.eth0 failed to start
* Bringing up interface eth1
* dhcp ...
* Running dhcpcd ...
dhcpcd[18807]: version 5.5.6 starting
dhcpcd[18807]: eth1: waiting for carrier
dhcpcd[18807]: timed out
dhcpcd[18807]: allowing 8 seconds for IPv4LL timeout
dhcpcd[18807]: timed out [ !! ]
* ERROR: net.eth1 failed to start
* Bringing up interface eth0
* dhcp ...
* Running dhcpcd ...
dhcpcd[18927]: dhcpcd already running on pid 30298 (/var/run/dhcpcd-eth0.pid) [ !! ]
* ERROR: net.eth0 failed to start
* Bringing up interface eth1
* dhcp ...
* Running dhcpcd ...
dhcpcd[19026]: version 5.5.6 starting
dhcpcd[19026]: eth1: waiting for carrier
dhcpcd[19026]: timed out
dhcpcd[19026]: allowing 8 seconds for IPv4LL timeout
dhcpcd[19026]: timed out [ !! ]
* ERROR: net.eth1 failed to start
* ERROR: cannot start netmount as net.eth0 would not start
* ERROR: cannot start apache2 as net.eth0 would not start
I am also using the NetworkManager. I don't know whether that's important.
If you need more informations let me know.

