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MAC address randomization in Ubuntu 17+ (>= 1.4.1): save to /etc/NetworkManager/conf.d/
# /etc/NetworkManager/conf.d/30-randomize-mac-address.conf
# REQUIRES NETWORK MANAGER >= 1.4.1 (Ubuntu Zesty and above)
# Thanks to
# This randomize your MAC address for *new* connections
# Be sure to change your existing (saved) connections in
# /etc/NetworkManager/system-connections/*
# NOTE: To support captive-portals that rely on a consistent mac address,
# use `cloned-mac-address=stable` in /etc/NetworkManager/system-connections/[network name]
# "yes" is already the default for scanning
# The options are:
# - permanent: use the hardware MAC
# - preserve: don’t change the MAC address of the device upon activation.
# - random: generate a randomized value upon each connect.
# - stable: generate a stable, hashed MAC address.
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armsp commented Dec 9, 2018

Hi Paul, coming here from your blog. I didn't quite understand how to do this part -

Be sure to change your existing (saved) connections in

So i followed your post and the suggestion from gnome's blog too, i.e made changes to the file in /usr/lib/NetworkManager/conf.d instead of directly editing the file in /etc/NetworkManager/conf.d. So far I haven't seen any changes in my mac address (same network) even after rebooting/ restarting network manager. Asked for help here by giving more details. Nothing so far.
Could you please elucidate how to do the quoted part above?

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