Comment 5 for bug 1621845

I also have the same problem.
In the absence of resolution. Would someone please give a workaround for amateurs ?

$sudo dpkg --configure redmine
Setting up redmine (3.2.1-2) ...
Determining localhost credentials from /etc/mysql/debian.cnf: succeeded.
chown: cannot access '/var/lib/redmine/Gemfile.lock': No such file or directory
dpkg: error processing package redmine (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 redmine

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial