Also there seems to be no interest in fixing this, for the record:
Problem and solution are still present/working in Ubuntu 17.10. and
Nvidia driver 384.
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Bugs, which is subscribed to python-qt4 in Ubuntu.
Also present in Kubuntu 17.04
Here the log (italian language):
Elaborazione dei trigger per plymouth-theme-kubuntu-text (1:17.04ubuntu6)...
dpkg: attenzione: version '/etc/lsb-release' has bad syntax: il numero di
versione non inizia con una cifra
My /etc/lsb-release content:
DISTRIB_ID=Ubuntu