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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:
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
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:
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?

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now I can't install anything as Software center and terminal both report that the package 'crossplatformui' needs to be uninstalled first Please help – Mysterio Dec 2 '11 at 23:06
There is a similar question on launchpad Can you see if step #6 helps if your comfortable with trying it. – itnet7 Dec 2 '11 at 23:22
Seems he had to reinstall Ubuntu as he wasn't able to solve the issue – Mysterio Dec 3 '11 at 0:47
Had you tried remove it? sudo apt-get remove crossplatformui – Andre Gil Dec 3 '11 at 4:20
up vote 3 down vote accepted

I solved the problem. I had same problem as you had. So what I did:

1- Go to Synaptic Package Manager and Remove [CrossPlatformUI] and all it's dependencies. + May be there still some package will be remain. No problem.

2- As is mentioned above, Run:

gksudo gedit /var/lib/dpkg/status

in terminal.

3- Search in the search area [Package: crossplatformui] You will find four or five line address. I forgot those lines and I can not find them because they are removed. But, any way; follow every line address to find those files.

4- When you find exact files, Right Click on that and choose open as administrator. When file is open, Remove the content of those and save it.

5- Do it for all files. Now go back to Synaptic Package Manager, and mark those package which are remain as completely remove. Synaptic Package Manager will remove those.

6- finally go to terminal again and run again:

gksudo gedit /var/lib/dpkg/status

7- Search for [Package: crossplatformui] again and delete all the informations.

8- You are done. You can check in terminal by running:

sudo apt-get remove CrossPlatformUI

9- As soon as you connect to Internet, run:

sudo apt-get update 

If you were right, there must be no error.

I hope this can help you, and sorry if I have forgot something. I am new to Linux. Good luck.

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Is it necessary to do steps 3,4,5? Can we not directly remove the content from section from the status file? – alok Aug 21 '13 at 5:08

Maybe we can bypass dpkg like this. First backup your original file:

sudo cp /var/lib/dpkg/status /var/lib/dpkg/status.orig

After that open it to edit:

gksudo gedit /var/lib/dpkg/status

Search for a block something like that:

Package: crossplatformui



Package: another_package_name

Here, you will delete only crossplatformui block. This means starting with Package: crossplatformui and till the other package block. After deleting the blocak try to remove it again:

sudo dpkg -r crossplatformui

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Well the only solution here is a complete re-install. Forcing that package to install messed up the system files beyond recovery

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Have you tried dpkg -P crossplatformui:architecture ?

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