I Tested netplan.io 0.103-0ubuntu5~20.04.2 inside a fresh Focal LXD container:
$ lxc launch ubuntu-daily:focal ff
$ lxc exec ff bash
=> Enabled focal-proposed & installed/upgraded netplan.io
root@ff:~# dpkg -l | grep netplan
ii libnetplan0:amd64 0.103-0ubuntu5~20.04.2
ii netplan.io 0.103-0ubuntu5~20.04.2
root@ff:~# netplan set network.bridges.br54.dhcp4=false
root@ff:~# netplan get # check that br54 is present
network:
bridges:
br54:
dhcp4: false
ethernets:
eth0:
dhcp4: true
root@ff:~# netplan apply
root@ff:~# ip link show br54 && echo OK
3: br54: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
mode DEFAULT group default qlen 1000
link/ether 06:0f:64:90:38:53 brd ff:ff:ff:ff:ff:ff
OK
root@ff:~# mkdir -p /tmp/np_backup/etc/ && cp -r /etc/netplan
/tmp/np_backup/etc/
root@ff:~# netplan set network.bridges.br54=null
root@ff:~# netplan get # check that br54 is NOT present
network:
ethernets:
eth0:
dhcp4: true
netplan apply --state /tmp/np_backup
root@ff:~# ip link show br54 && echo ERROR
Device "br54" does not exist.
In accordance with https://wiki.ubuntu.com/NetplanUpdates I'm also attaching
the full autopkgtest logs for those builds:
https://git.launchpad.net/~slyon/+git/files/tree/LP1943120/focal_amd64.log
https://git.launchpad.net/~slyon/+git/files/tree/LP1943120/focal_arm64.log
https://git.launchpad.net/~slyon/+git/files/tree/LP1943120/focal_armhf.log
https://git.launchpad.net/~slyon/+git/files/tree/LP1943120/focal_ppc64el.log
https://git.launchpad.net/~slyon/+git/files/tree/LP1943120/focal_s390x.log
** Tags removed: verification-needed-focal
** Tags added: verification-done-focal
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https://bugs.launchpad.net/bugs/1943120
Title:
interface not removed
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