Bug#919765: kpat: kapt cannot start, symbol lookup error

[Bernhard Übelacker <bernhardu@mailbox.org>]

Hello Steve,
I suspect this lookup error is because you have 
knewstuff packages in version 5.54.0-1 installed,
which is not yet in testing (and barely in unstable).

Could reproduce it with packages below installed:
  http://ftp.de.debian.org/debian/pool/main/k/knewstuff/libkf5newstuff5_5.54.0-1_amd64.deb
  http://ftp.de.debian.org/debian/pool/main/k/knewstuff/libkf5newstuff-data_5.54.0-1_all.deb

Could you test if downgrading knewstuff to testing
version 5.51.0-1 solves your issue?

Kind regards,
Bernhard