Public bug reported:

Each time I tether my android phone it "invents" a new link mac, which
means it appears as a completely new connection.

This disables any possibility to script around it, and also spams the
network-manager connections. See for instance:

$ LC_ALL=C ls -l /etc/NetworkManager/system-connections/enx*
-rw------- 1 root root 274 Apr  8 14:56 
/etc/NetworkManager/system-connections/enx0e6f8a3e2e15
-rw------- 1 root root 274 Apr  6 16:28 
/etc/NetworkManager/system-connections/enx0ea18f9e836a
-rw------- 1 root root 274 Apr  7 17:39 
/etc/NetworkManager/system-connections/enx22cc150ee0b4
-rw------- 1 root root 274 Apr 15 13:12 
/etc/NetworkManager/system-connections/enx2e9fcfdefa59
-rw------- 1 root root 274 Apr  8 09:51 
/etc/NetworkManager/system-connections/enx32425d1a7a70
-rw------- 1 root root 274 Apr 12 16:38 
/etc/NetworkManager/system-connections/enx4a322318b6cf
-rw------- 1 root root 274 Apr  7 12:11 
/etc/NetworkManager/system-connections/enx8a5fba99d94a
-rw------- 1 root root 274 Apr 13 17:47 
/etc/NetworkManager/system-connections/enx965abc0d0f95
-rw------- 1 root root 274 Apr  6 07:21 
/etc/NetworkManager/system-connections/enx96f7e764ccd1
-rw------- 1 root root 274 Apr  8 09:46 
/etc/NetworkManager/system-connections/enxae86f6debca2
-rw------- 1 root root 274 Apr 14 11:31 
/etc/NetworkManager/system-connections/enxb211686fc216
-rw------- 1 root root 274 Apr 14 17:56 
/etc/NetworkManager/system-connections/enxb2363bfd7e9d
-rw------- 1 root root 274 Apr  9 16:38 
/etc/NetworkManager/system-connections/enxb2faef0e351f
-rw------- 1 root root 274 Apr 11 20:06 
/etc/NetworkManager/system-connections/enxbe1c074d36e5
-rw------- 1 root root 274 Apr  8 15:17 
/etc/NetworkManager/system-connections/enxbebbbac838e6
-rw------- 1 root root 274 Apr  5 19:56 
/etc/NetworkManager/system-connections/enxfe990c161b66

For usb devices the old behavior of keeping usb0 (or maybe usp1d1
depending on where it is plugged), should be kept. Else the usb
vendor/product is could be used to keep a stable name

** Affects: dbus-property-service (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1570800

Title:
  network interface renaming doesn't work with usb tethering

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