Verification-done on disco:

ubuntu@ip-172-30-0-243:~$ lsb_release -cs
disco
ubuntu@ip-172-30-0-243:~$ dpkg -l netplan.io systemd | grep ii
ii  netplan.io     0.98-0ubuntu1~19.04.1 amd64        YAML network 
configuration abstraction for various backends
ii  systemd        240-6ubuntu5.7        amd64        system and service manager
ubuntu@ip-172-30-0-243:~$ sudo netplan apply
ubuntu@ip-172-30-0-243:~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode 
DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 6666 qdisc fq_codel state UP 
mode DEFAULT group default qlen 1000
    link/ether 06:92:5b:c9:b5:3d brd ff:ff:ff:ff:ff:ff
ubuntu@ip-172-30-0-243:~$ networkctl
IDX LINK             TYPE               OPERATIONAL SETUP     
  1 lo               loopback           carrier     unmanaged 
  2 eth0             ether              routable    configured

2 links listed.
ubuntu@ip-172-30-0-243:~$ sysctl net.ipv6.conf.eth0.mtu
net.ipv6.conf.eth0.mtu = 5634
ubuntu@ip-172-30-0-243:~$ cat /etc/netplan/50-cloud-init.yaml 
# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            match:
                macaddress: 06:92:5b:c9:b5:3d
            set-name: eth0
            ipv6-mtu: 5634
            mtu: 6666
            dhcp6: true
            dhcp4-overrides:
                use-mtu: false
            dhcp6-overrides:
                use-mtu: false


** Tags added: verification-done-disco

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https://bugs.launchpad.net/bugs/1671951

Title:
  networkd should allow configuring IPV6 MTU

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