Public bug reported:

$ sudo apt install dovecot-antispam dovecot-core dovecot-imapd dovecot-
managesieved dovecot-pop3d dovecot-sieve

...

Failed to restart dovecot.service: Unit var.mount is masked.
invoke-rc.d: initscript dovecot, action "restart" failed.
● dovecot.service - Dovecot IMAP/POP3 email server
     Loaded: loaded (/lib/systemd/system/dovecot.service; enabled; vendor 
preset: enabled)
     Active: inactive (dead)
       Docs: man:dovecot(1)
             http://wiki2.dovecot.org/
dpkg: error processing package dovecot-core (--configure):
 installed dovecot-core package post-installation script subprocess returned 
error exit status 1
Errors were encountered while processing:
 dovecot-core
E: Sub-process /usr/bin/dpkg returned an error code (1)

1) Ubuntu release:
$ lsb_release -sd
Ubuntu 20.04.2 LTS

2) Package version
$ apt-cache policy dovecot-core
dovecot-core:
  Installed: 1:2.3.7.2-1ubuntu3.4
  Candidate: 1:2.3.7.2-1ubuntu3.4
  Version table:
 *** 1:2.3.7.2-1ubuntu3.4 500
        500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     1:2.3.7.2-1ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages

3) Expected
Install to complete without error

4) `apt install dovecot-core` generated an error when trying to restart
"dovecot.service"

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: dovecot-core 1:2.3.7.2-1ubuntu3.4
ProcVersionSignature: Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-59-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Jun 26 20:27:45 2021
ErrorMessage: installed dovecot-core package post-installation script 
subprocess returned error exit status 1
InstallationDate: Installed on 2021-06-27 (0 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 
3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt  2.0.5
SourcePackage: dovecot
Title: package dovecot-core 1:2.3.7.2-1ubuntu3.4 failed to install/upgrade: 
installed dovecot-core package post-installation script subprocess returned 
error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: dovecot (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package focal

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https://bugs.launchpad.net/bugs/1933750

Title:
  package dovecot-core 1:2.3.7.2-1ubuntu3.4 failed to install/upgrade:
  installed dovecot-core package post-installation script subprocess
  returned error exit status 1

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