package transmission-daemon 2.92-2ubuntu3.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Josiah Brown]

User@mjb:/$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  libmirclient-dev libmircommon-dev libmircookie-dev libmircookie2
  libmircore-dev libprotobuf-dev libxkbcommon-dev linux-headers-4.13.0-19
  linux-headers-4.13.0-19-generic linux-image-4.13.0-19-generic
  linux-image-extra-4.13.0-19-generic linux-signed-image-4.13.0-19-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 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 transmission-daemon (2.92-2ubuntu3.1) ...
Job for transmission-daemon.service failed because the control process exited with error code.
See "systemctl status transmission-daemon.service" and "journalctl -xe" for details.
invoke-rc.d: initscript transmission-daemon, action "start" failed.
● transmission-daemon.service - Transmission BitTorrent Daemon
   Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2018-01-28 21:21:24 CST; 6ms ago
  Process: 17620 ExecStart=/usr/bin/transmission-daemon -f --log-error (code=exited, status=1/FAILURE)
 Main PID: 17620 (code=exited, status=1/FAILURE)

Jan 28 21:21:24 mjb systemd[1]: Starting Transmission BitTorrent Daemon...
Jan 28 21:21:24 mjb transmission-daemon[17620]: [2018-01-28 21:21:24.932] JSON parse failed in /var/lib/transmission-daemon/.config/transmission-daemon/settings.json at pos 461: ESCAPE_INVALID -- remaining text " Book/",
Jan 28 21:21:24 mjb transmission-daemon[17620]: "do"
Jan 28 21:21:24 mjb transmission-daemon[17620]: [2018-01-28 21:21:24.932] transmission-daemon Error loading config file -- exiting. (daemon.c:693)
Jan 28 21:21:24 mjb systemd[1]: transmission-daemon.service: Main process exited, code=exited, status=1/FAILURE
Jan 28 21:21:24 mjb systemd[1]: Failed to start Transmission BitTorrent Daemon.
Jan 28 21:21:24 mjb systemd[1]: transmission-daemon.service: Unit entered failed state.
Jan 28 21:21:24 mjb systemd[1]: transmission-daemon.service: Failed with result 'exit-code'.
dpkg: error processing package transmission-daemon (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 transmission-daemon
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 17.10
Package: transmission-daemon 2.92-2ubuntu3.1
ProcVersionSignature: Ubuntu 4.13.0-21.24-generic 4.13.13
Uname: Linux 4.13.0-21-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
Date: Sun Jan 28 21:15:53 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-10-26 (94 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
Python3Details: /usr/bin/python3.6, Python 3.6.3, unpackaged
PythonDetails: /usr/bin/python2.7, Python 2.7.14, python-minimal, 2.7.14-2ubuntu1
RelatedPackageVersions:
 dpkg 1.18.24ubuntu1
 apt 1.5.1
SourcePackage: transmission
Title: package transmission-daemon 2.92-2ubuntu3.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.transmission-daemon.settings.json: [modified]
mtime.conffile..etc.transmission-daemon.settings.json: 2017-12-21T12:55:36.045583

[Jean-Baptiste Lallement (jibel)]

From dpkg.log

Setting up transmission-daemon (2.92-2ubuntu3.1) ...
Job for transmission-daemon.service failed because the control process exited with error code.
See "systemctl status transmission-daemon.service" and "journalctl -xe" for details.
invoke-rc.d: initscript transmission-daemon, action "start" failed.
● transmission-daemon.service - Transmission BitTorrent Daemon
   Loaded: loaded (/lib/systemd/system/transmission-daemon.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2018-01-28 21:15:53 CST; 5ms ago
  Process: 20964 ExecStart=/usr/bin/transmission-daemon -f --log-error (code=exited, status=1/FAILURE)
 Main PID: 20964 (code=exited, status=1/FAILURE)

Jan 28 21:15:53 mjb systemd[1]: Starting Transmission BitTorrent Daemon...
Jan 28 21:15:53 mjb transmission-daemon[20964]: [2018-01-28 21:15:53.703] JSON parse failed in /var/lib/transmission-daemon/.config/transmission-daemon/settings.json at pos 461: ESCAPE_INVALID -- remaining text " Book/",
Jan 28 21:15:53 mjb transmission-daemon[20964]: "do"
Jan 28 21:15:53 mjb transmission-daemon[20964]: [2018-01-28 21:15:53.703] transmission-daemon Error loading config file -- exiting. (daemon.c:693)
Jan 28 21:15:53 mjb systemd[1]: transmission-daemon.service: Main process exited, code=exited, status=1/FAILURE
Jan 28 21:15:53 mjb systemd[1]: Failed to start Transmission BitTorrent Daemon.
Jan 28 21:15:53 mjb systemd[1]: transmission-daemon.service: Unit entered failed state.
Jan 28 21:15:53 mjb systemd[1]: transmission-daemon.service: Failed with result 'exit-code'.
dpkg: error processing package transmission-daemon (--configure):
 subprocess installed post-installation script returned error exit status 1