Prob in ubuntu, aircrack-ng not working

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I've tried aircrack-ng in BackTrack 3,4 & Fedora core 12, but I'm facing a prob while I'm trying it in Ubuntu 10.04 while my wireless adopter is working properly & able to connect through it. rootnet47@rootnet47-laptop:~$ sudo su [sudo] password for rahul: root@rahul-laptop:/home/rahul# airmon-ng Interface Chipset Driver wlan0 Intel 4965/5xxx iwlagn - [phy0] root@rahul-laptop:/home/rahul# airodump-ng wlan0 ioctl(SIOCSIWMODE) failed: Device or resource busy 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 wlan0 ' Sysfs injection support was not found either. please help me!