package initramfs-tools 0.122ubuntu8 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Björn Schmidt]

just updating ubuntu mate, then this erroe occured

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: initramfs-tools 0.122ubuntu8
Uname: Linux 3.4.108 armv7l
ApportVersion: 2.19.1-0ubuntu5
Architecture: armhf
Date: Fri Apr 29 17:14:59 2016
DuplicateSignature: package:initramfs-tools:0.122ubuntu8:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.122ubuntu8 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-04-29 (0 days ago)
mtime.conffile..etc.initramfs.tools.initramfs.conf: 2016-02-21T22:22:01

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Benjamin Drung (bdrung)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The relevant dpkg terminal log says:

E: No boot partition found !

The df log shows that no /boot partition is mounted. Can you check if you have a separate boot partition and mount it?

[Launchpad Janitor (janitor)]

[Expired for initramfs-tools (Ubuntu) because there has been no activity for 60 days.]