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Use Ubuntu 16.04 LTS, what happened was the following. All the connections stopped working from one moment to another, I had a fault in the internet, the networks fell but when the internet came back, the connection did not work again either wired or wireless, neither by bluetooth nor by usb, and gives that error when I frame journalctl -xe :

kernel: audit: type=1400 audit(1549657329.185:141): apparmor="DENIED" operation="open" profile="/usr/lib/NetworkManager/nm-dhcp-helper" name="/usr/lo"

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