Hola, tengo tarjeta Atheros AR9285.Primero instale Ubuntu 9.10 y todo me iba bien hasta que no cambie a Ubuntu 10.04, y ahora no puedo injectar, hacer el "handshake" aun menos. A que se debe esto?

No e puesto ningun parche y tampoco se como hacer lo. Ahora resulta que no puedo captar el handshake, con las WEP me va bien,no se que pasa.

 La tarjeta que tengo es Atheros AR9285.
Cuando intento hacer el ataque aireplay-ng -0...., es lo que me aparece:
18:51:46 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:47 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:47 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:48 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:48 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|66 ACKs]
18:51:49 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:49 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:50 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:50 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
18:51:51 Sending 64 directed DeAuth. STMAC: [78:E4:00:15:06:8F] [ 0|64 ACKs]
Me puede ayudar algien? Gracias!