I am trying to upgrade my system (Linux mint 17):

$ sudo apt-get upgrade

And this is the output, (I have tried this more than once so I am copy+pasting the latest output)

Reading package lists... Done

Building dependency tree

Reading state information... Done

Calculating upgrade... Done

The following packages have been kept back: facter libqt5gui5 linux-generic linux-headers-generic linux-image-generic mintupdate python-pip

0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.

1 not fully installed or removed.

After this operation, 0 B of additional disk space will be used.

Do you want to continue? [Y/n] y

Setting up puppetmaster (3.8.1-1puppetlabs1) ...

  • Starting puppet master

could not change to group "pe-puppet"

Could not change to user pe-puppet: Invalid user: pe-puppet

invoke-rc.d: initscript puppetmaster, action "start" failed.

dpkg: error processing package puppetmaster (--configure): subprocess installed post-installation script returned error exit status 74

Errors were encountered while processing: puppetmaster

E: Sub-process /usr/bin/dpkg returned an error code (1)

What is the issue with puppetmaster?

Could not change to user pe-puppet: Invalid user: pe-puppet

This means your system does not have the user (and group) pe-puppet.

You can create the user and group and it should work fine.

sudo useradd -U pe-puppet

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