My laptop runs a hardware driver called Broadcom BCM4315.
when i reboot eth1 and trying to do airodump-ng eth1 then it fails... :
ioctl(SIOCSIWMODE) failed: Invalid argument

ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>'
Sysfs injection support was not found either.

and when i write:
airmon-ng start eth1 <#>

i prints:
bash: syntax error near unexpected token 'newline'