Unfortunately the previous modification doesn't works anymore. Anyway I noticed a comma in the file /etc/NetworkManager/NetworkManager.conf.dpkg-old :
[main] plugins=ifupdown,keyfile
no-auto-default=00:xx:xx:xx:xx:xx , <-----(?)
[ifupdown] managed=false I removed it and now everyting seems to be fine. Fingers crossed.
Unfortunately the previous modification doesn't works anymore. Anyway I noticed a comma in the file /etc/NetworkMan ager/NetworkMan ager.conf. dpkg-old :
[main] ifupdown, keyfile
plugins=
no-auto- default= 00:xx:xx: xx:xx:xx , <-----(?)
[ifupdown]
managed=false
I removed it and now everyting seems to be fine. Fingers crossed.