Results of grep -ri wlan0 /etc cmd:

/etc/dhcp-probe/dhcp-probe.wlan0:INTERFACE="wlan0"
/etc/udev/rules.d/70-persistent-net.rules:SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0f:3d:ad:c3:c8", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"
grep: /etc/others-menu/0000_kismet.desktop: No such file or directory
grep: /etc/apparmor.d/disable/usr.bin.firefox-3.5: No such file or directory
grep: /etc/printcap: No such file or directory
grep: /etc/dhcpc/resolv.conf: No such file or directory
grep: /etc/alternatives/usplash-artwork.so: No such file or directory
/etc/kismet/kismet.conf~:source=madwifi_ag,wlan0,madwifi
/etc/kismet/kismet.conf:ncsource=wlan0:option1=foo,option2=bar
/etc/kismet/kismet.conf:source=madwifi_ag,wlan0,madwifi
/etc/iptables.sav:-A FORWARD -s 192.168.3.0/24 -i eth0 -o wlan0 -m conntrack --ctstate NEW -j ACCEPT
grep: /etc/migrationtools/migrate_common.ph: No such file or directory
/etc/network/interfaces_bup:auto wlan0
/etc/network/interfaces_bup:#iface wlan0 inet dhcp
/etc/network/interfaces:auto wlan0
/etc/network/interfaces:iface wlan0 inet dhcp
/etc/network/interfaces_new:iface wlan0 inet dhcp
/etc/network/interfaces_new:#auto wlan0
/etc/network/interfaces_old:auto wlan0
/etc/network/interfaces_0:auto wlan0
/etc/network/interfaces_0:#iface wlan0 inet dhcp