ddstreet's ppa included a hotfix for this which was installed on Cust
lab MAAS region controller.  A machine was deployed which included a
subnet defined with MTU 9202 and two NICs in a bond.  After deployment,
the bond showed MTU 9202 (used ifconfig), and the /e/n/interfaces file
was coded in a way that a manual reboot preserved the MTU 9202 setting
for the bond.

$ dpkg -s curtin
Package: curtin
Status: install ok installed
Priority: extra
Section: admin
Installed-Size: 11
Maintainer: Ubuntu Developers <>
Architecture: all
Version: 0.1.0~bzr424-0ubuntu1~ubuntu16.04.1
Depends: bcache-tools, btrfs-tools, dosfstools, file, gdisk, lvm2, mdadm, 
parted, python3-curtin (= 0.1.0~bzr424-0ubuntu1~ubuntu16.04.1), udev, xfsprogs
Description: Library and tools for the curtin installer
 This package provides the curtin installer.
 Curtin is an installer that is blunt, brief, snappish, snippety and

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  IPv6 MTU not applied correctly for pure IPv6 interfaces

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