Cydia error: running sub-process /usr/bin/dpkg returned an error code (2)

In certain cases when you installing apps on Cydia you might get following error:

Error: running sub-process /usr/bin/dpkg returned an error code (2)

This error message appears to be related to some file corruption in your Cydia.
To fix it, follow these steps:

1. Navigate to /var/lib/dpkg/ directory.
2. Rename "available" to "available-bak".
3. Rename "status" to "status-bak".
4. Rename "available-old" to "available".
5. Rename "status-old" to "status".
6. Start Cydia and allow it to load everything it needs. Try to install or remove some apps to verify the error is fixed.