This should provide you with a quick fix. It makes a couple of
assumptions such as, that you've attempted to install libjpeg-progs and
it's failed. Basically it goes and grabs the package from your cache,
extracts out the package, changes the control file to allow it to
resolve the conflict and changes the version number (appends this bug
report number to it), bundles it back up into a package and then
installs the package. It's also untested and assumes you don't have
packages in your home folder (libjpeg-progs).

#!/bin/bash
mkdir ~/libjpeg-progs
cp /var/cache/apt/archives/libjpeg-progs* ~/libjpeg-progs
cd ~/libjpeg-progs
ar x libjpeg-progs*.deb
rm libjpeg-progs*.deb debian-binary
tar xvf data.tar.* && rm data.tar.*
tar xvf control.tar.* --directory DEBIAN && rm control.tar.*
cd DEBIAN
if [ -z "$( grep "^Replaces:" control )" ] ; then
  sed '/^Version:/ iReplaces: libjpeg-turbo-progs' control -i
else
  sed 's/\(^Replaces: .*\)/\1, libjpeg-turbo-progs/' control -i
fi
sed 's/\(^Version: .*\)/\1-1550124/' control -i
cd ~
dpkg -b libjpeg-progs .
sudo dpkg -i libjpeg-progs*.deb

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to libjpeg8-empty in Ubuntu.
https://bugs.launchpad.net/bugs/1550124

Title:
  package libjpeg-progs 8c-2ubuntu8 failed to install/upgrade: trying to
  overwrite '/usr/bin/rdjpgcom', which is also in package libjpeg-turbo-
  progs 1.4.2-0ubuntu1

Status in libjpeg8-empty package in Ubuntu:
  Confirmed

Bug description:
  update failed with this.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: libjpeg-progs 8c-2ubuntu8
  ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
  Uname: Linux 4.4.0-2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  Date: Mon Feb 22 20:02:43 2016
  ErrorMessage: trying to overwrite '/usr/bin/rdjpgcom', which is also in 
package libjpeg-turbo-progs 1.4.2-0ubuntu1
  InstallationDate: Installed on 2012-09-23 (1251 days ago)
  InstallationMedia: Ubuntu GNOME Remix 12.10 "Quantal Quetzal" - Alpha 
amd64(20120922)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.3
  SourcePackage: libjpeg8-empty
  Title: package libjpeg-progs 8c-2ubuntu8 failed to install/upgrade: trying to 
overwrite '/usr/bin/rdjpgcom', which is also in package libjpeg-turbo-progs 
1.4.2-0ubuntu1
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libjpeg8-empty/+bug/1550124/+subscriptions

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