package snapd 2.27.6~14.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Prateek Bhamri]

occurred after the latest update

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: snapd 2.27.6~14.04
ProcVersionSignature: Ubuntu 4.4.0-95.118~14.04.1-generic 4.4.83
Uname: Linux 4.4.0-95-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Sat Sep 16 00:39:55 2017
DuplicateSignature:
 package:snapd:2.27.6~14.04
 Setting up snapd (2.27.6~14.04) ...
 Failed to execute operation: No such file or directory
 dpkg: error processing package snapd (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-09-09 (6 days ago)
InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.2
 apt 1.2.24
SourcePackage: snapd
Title: package snapd 2.27.6~14.04 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2017-09-09 (6 days ago)

[Oliver Grawert (ogra)]

DistroRelease: Ubuntu 16.04
Package: snapd 2.27.6~14.04
...
UpgradeStatus: Upgraded to xenial on 2017-09-09 (6 days ago)

the snapd package should have been replaced by 2.27.6 (no ~14.04 suffix) during the upgrade to xenial. how was this system upgraded (using apt ? using do-release-upgrade or the graphical update manager ?)

[Launchpad Janitor (janitor)]

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