Subprocess Post Installation Script Cydia
I went to install bsnes the other day and for whatever reason the installation failed. Now, I cannot update, install new packages, or do basically any apt-get commands as they all try to process this broken package and fail. Attempting to install a new package also just dooms it to the same fate. The error I get is:
Error usr/var/lib/dpkg returned error code 100 I. Dec 11, 2014 code (1). Sub-process /usr/bin/dpkg returned an error code (1) cydia. This error can course sometime. General Getting errors when installing/uninstalling apps. Something while I am in Cydia. Subprocess post-installation script returned. Nov 29, 2015 - Hello. I am facing this problem while deleting a jailbreak tweak from Cydia. I deleted it via ifile also. I also deleted its repo but when I tried to.
I have been searching on Google and here on Ask Ubuntu but have not found a working solution. The commonly suggested fix is to run the following:
Select a RAW image to apply Picture Style file. Start Digital Photo Professional to display a RAW image. Using Digital Photo Professional to apply a Picture Style File to a RAW image. 
This however does not work. The apt-get commands all fail with the same error as above and the dpkg command just doesn't help. The other thing they often suggest to purge it via Synaptic or the command line, which also fails.
Thanks for the help
8 Answers
For advanced users, use at your own risks.
According to the following error message :
You may want to edit /var/lib/dpkg/info/[package_name].postinst and comment everything (or better yet, try to understand it and identify the issue), then try apt-get again.
Note that though in this particular question the message concerns 'post-installation', it could have mentioned e.g. 'pre-removal' or 'post-removal' instead (in which cases the extension of the file to be edited would have been .prerm or .postrm).
Other than those which you have already posted, there are few other commands which can be helpful.
Autoclean clears out the local repository of retrieved package files.
Force installation/removal of packages. ☠Use with caution
and
Also as always, you can use dpkg to install, remove and purge packages.
Install
Remove
Purge
So, after more googling and really carefully reading through the error messages again it seems that dpkg needed to be reinstalled.
What tipped off that this was the problem (if anyone searches and sees this) is that update-alternatives: not found was in the error message. As soon as dpkg was reinstalled, the other packages proceeded to install normally automatically.
You can remove the package file in this /var/lib/dpkg/info/ path and update the source.
Cydia Subprocess Post-installation Script Returned Error Exit Status 1
Then, reinstall your package sudo apt-get install [package_name]
If all else fails. What I did was I first changed the directory to:
then I removed everything with .postinst:
then update repository
then everything went back to normal when I did:
If all else fails, you can manually remove the package through dpkg. Running sudo dpkg -P bsnes should purge bsnes.
Fence Post Installation
In my case apt-get install -f worked. I was installing mysql-workbench-community
Previously tried apt autoclean
I saw that dpkg error due to some missing dependencies which could be corrected by installing in forced mode( installing dependencies)
After running above, you can install/upgrade/remove/purge as usual for any packages.
protected by Community♦Oct 1 '17 at 19:25
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