Debian Configuration :: Internet For Acer Extensa 5220 Laptop On Stretch

I have installed debian stretch on this machine, but can't get wired ethernet running. Using Slitaz live disc, the wired connection works. Guess I am missing a package or two.

Slitaz system (2.6.37) info reports:

Code: Select alltg3:  Broadcom Tigon3 ethernet driver
ath5k : Support for 5xxx series of Atheros 802.11 wireless LAN cards
ath:  Shared library for Atheros wireless LAN cards
mac80211:  IEEE 802.11 subsystem
cfg80211:  wireless configuration support
rfkill:  RF switch support

PCI device list:

Code: Select allEthernet controller:  Broadcom Corporation Netlink BCM5787M Gigabit Ethernet PCI Express
Ethernet controller:  Atheros Communications Inc. AR242x/AR542x Wireless Network Adaptor

Interfaces: lo, dummy0, eth0, wlan0

So it looks to me I need drivers for:

wired interface - Broadcom BCM5787M
wireless interface - Atheros Communications Inc. AR242x/AR542x

The debian scratch I have installed on the laptop gives me this info:

Code: Select alllspci -vvnn | grep -A 9 Network
04:00.0 Ethernet controller [0200]: Qualcomm Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) [168c:001c] (rev 01)
   Subsystem: Quanta Microsystems, Inc Device [1a32:0105]
   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-

[Code] ....

Output of lsmod:
Code: Select allModule                  Size  Used by
cpufreq_stats          12694  0
cpufreq_powersave      12422  0
binfmt_misc            12733  1
cpufreq_conservative    13872  0

[Code] ...

It looks like the required modules have been loaded, e.g. for wired, tg3

dmesg contains:
Code: Select all[    1.861173] PTP clock support registered
[    1.862488] tg3.c:v3.137 (May 11, 2014)
[    1.892663] tg3 0000:02:00.0 eth0: Tigon3 [partno(BCM95787m) rev b002] (PCI Express) MAC address 00:1d:72:15:e4:4d

[Code] ....

My etc/network/interfaces file is:
Code: Select all# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

[Code] ....

And ifconfig yields:

Code: Select allifconfig
lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:70 errors:0 dropped:0 overruns:0 frame:0
          TX packets:70 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:22264 (21.7 KiB)  TX bytes:22264 (21.7 KiB)

So no eth0. How can I fix this?