Bug#1063151: igb: unpredictable interface names for four port nic

[Valentin]

>   eth0: Policy *slot* yields "ens6f0".
>   eth0: Could not set AlternativeName= or apply AlternativeNamesPolicy=,
> ignoring: File exists eth0:
> /usr/lib/udev/rules.d/80-net-setup-link.rules:11 NAME 'ens6f0' eth0:
> /usr/lib/udev/rules.d/99-systemd.rules:68 RUN '/lib/systemd/systemd-sysctl
> --prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$name
> --prefix=/net/ipv6/conf/$name --prefix=/net/ipv6/neigh/$name' eth0:
> sd-device: Created db file '/run/udev/data/n69' for
> '/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/net/eth0' ens6f0: Failed to
> rename network interface 69 from 'eth0' to 'ens6f0': File exists

It looks like your BIOS is reporting the same PCIe Slot for both your igb and 
Broadcom network cards.
I assume one of your Broadcom network interfaces is already named ens6f0.

In fact., this might be a BIOS issue...
whats the output of `sudo dmidecode -t9`?

Best solution for you is probably to set all or some network interface names 
manually, see https://wiki.debian.org/
NetworkInterfaceNames#CUSTOM_SCHEMES_USING_.LINK_FILES

Cheers,
Valentin
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