Note that I had a problem with the same symptom, and in the end, what solved it was killing wpa_supplicant, as suggested in this bug comment: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1294044/comments/9
Note that I had a problem with the same symptom, and in the end, what solved it was killing wpa_supplicant, as suggested in this bug comment: /bugs.launchpad .net/ubuntu/ +source/ network- manager/ +bug/1294044/ comments/ 9
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