Comment 11 for bug 1736975

I an using Ubuntu Server as a KVM-host, relying on multiple anonymous bridges, and am suffering from this bug under 18.04.

For others needing a workaround: I do configure the bridges with netplan.io as usual and bring up the bridges by defining in file

/etc/systemd/network/10-netplan-brUp.network
----------------------------------------------
[Match]
Name=brLAN*
Name=brDMZ*

[Network]
LinkLocalAddressing=no
ConfigureWithoutCarrier=true
----------------------------------------------

bringing up multiple bridges following the naming scheme brLAN0, brLAN1, ... , brDMZ0, brDMZ1, ...

I do prefer this solution over some other workarounds using systemd service files or others, that I found on the net. Maybe this helps...