Comment 7 for bug 2078759

With Danilo comment #4, it works fine if we could remove the comment.

u@oak2-10:~$ nmcli connection add type dummy ifname d0
Connection 'dummy-d0' (2364f50d-72d5-4849-804d-f6d28467bf93) successfully added.
u@oak2-10:~$ sudo cat /lib/netplan/00-network-manager-all.yaml·
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
u@oak2-10:~$ sudo md5sum /lib/netplan/00-network-manager-all.yaml
81c200b0e29eeb56c518a23eb78777ab /lib/netplan/00-network-manager-all.yaml

u@oak2-10:~$ nmcli connection delete dummy-d0·
Connection 'dummy-d0' (2364f50d-72d5-4849-804d-f6d28467bf93) successfully deleted.
u@oak2-10:~$ sudo md5sum /lib/netplan/00-network-manager-all.yaml
9b5681f7d3fc877b018790626772c504 /lib/netplan/00-network-manager-all.yaml

u@oak2-10:~$ sudo cat /lib/netplan/00-network-manager-all.yaml
network:
  version: 2
  renderer: NetworkManager

u@oak2-10:~$ nmcli connection add type dummy ifname d1
Connection 'dummy-d1' (f9e7f8f7-d685-4123-88e6-118f70342320) successfully added.
u@oak2-10:~$ sudo md5sum /lib/netplan/00-network-manager-all.yaml
9b5681f7d3fc877b018790626772c504 /lib/netplan/00-network-manager-all.yaml

u@oak2-10:~$ nmcli connection delete dummy-d1·
Connection 'dummy-d1' (f9e7f8f7-d685-4123-88e6-118f70342320) successfully deleted.
u@oak2-10:~$ sudo md5sum /lib/netplan/00-network-manager-all.yaml
9b5681f7d3fc877b018790626772c504 /lib/netplan/00-network-manager-all.yaml