just got this problem
any solutions?

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edit: SOLVED

it's due to the package 'wireless-tools' (which was pulled in by an updated version of qnetman2) installed from the rzr-debian repository

the script '/etc/network/if-pre-up.d/wireless-tools' from this package caused this problem

removing 'wireless-tools' AND (manually) the script solved this

installing 'wireless-tools' from the official repository won't cause this problem