UCP install error

[turdferguson68]

While updating through the module I encountered this error:

Please wait while module actions are performed
Installing ucp
Updating tables ucp_sessions...Done
System : debian
icu, pkg-config or pkgconf is not installed. You need to run: apt-get install icu libicu-devel pkg-config pkgconf
Error(s) installing ucp:
Failed to run installation scripts
Updating Hooks...Done

looks like the tiredofit image experienced the same issue in the past:
tiredofit/docker-freepbx#116