aircrack-ng channel hopping issue

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http://askubuntu.com – I cannot stop channel hopping on latest ubuntu, on aircrack website it sais that newotk managers or similar programs cause this...when launching airmon-ng it warns me that processes like dhcpi, network-manager can cause problems. I tried to kill these processes with sudo kill -9 pid but the processes are immediately restarted. I am using the ath9k driver. (HowTos)