Plesk update fails on Ubuntu: cp: cannot stat '/usr/share/imunify360-webshield/captcha/templates/head.tpl': No such file or directory

Issue

• OS or Plesk update fails with the following messages:

  The following packages have unmet dependencies:
  imunify360-firewall : Depends: imunify360-webshield-bundle (>= 1.20.119-14) but 1.20.1-17 is installed 
  E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

• Executing the suggested command results in the following:

  cp: cannot stat '/usr/share/imunify360-webshield/captcha/templates/head.tpl': No such file or directory
  dpkg: error processing archive /var/cache/apt/archives/imunify360-webshield-bundle_1.20.119-14_amd64.deb (--unpack): 
  new imunify360-webshield-bundle package pre-installation script subprocess returned error exit status 1 
  Errors were encountered while processing: 
  /var/cache/apt/archives/imunify360-webshield-bundle_1.20.119-14_amd64.deb 
  E: Sub-process /usr/bin/dpkg returned an error code (1)

Environment

• Imunify360
• Ubuntu
• Plesk

Solution

1. Remove the problem package:

   # dpkg -r --force-depends imunify360-webshield-bundle

2. Fix the inconsistency:

   # apt --fix-broken install

3. Proceed with the update.

Cause

The package installation script fails due to a corrupted package on the system.