A few weeks ago I installed a 32 bit .deb file through the 'force architecture' command (on my 64bit notebook), however the procedure was unsuccessful and I used the apt-get purgecommand to uninstall the app. It seems there are some leftovers of the app I uninstalled which has now broken system update. Synaptic recommended a sudo apt-get install -fwhich I did in the terminal with this initial response:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following package was automatically installed and is no longer required:

  libntfs10

Use 'apt-get autoremove' to remove them.

The following packages will be REMOVED:

  crossplatformui

0 upgraded, 0 newly installed, 1 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]?

I chose 'Y' then got this response:

(Reading database ... 187616 files and directories currently installed.)

Removing crossplatformui ...

ztemtvcdromd: no process found

dpkg: error processing crossplatformui (--remove):

 subprocess installed post-removal script returned error exit status 1

Errors were encountered while processing:

 crossplatformui

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

It seems the app I installed crossplatformuiis still on my system and has caused update manager to stop running with a partial upgrade warning. What do I do now?