This bug was fixed in the package partman-auto - 134ubuntu7
--------------- partman-auto (134ubuntu7) artful; urgency=medium
* Bump minimum and maximum sizes for /boot partitions on default, x86, and EFI platforms to a minimum of 512Mb and maximum of 768Mb. (LP: #1716999)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 13 Sep 2017 11:35:21 -0700
This bug was fixed in the package partman-auto - 134ubuntu7
---------------
partman-auto (134ubuntu7) artful; urgency=medium
* Bump minimum and maximum sizes for /boot partitions on default, x86, and
EFI platforms to a minimum of 512Mb and maximum of 768Mb. (LP: #1716999)
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 13 Sep 2017 11:35:21 -0700