Can't get uid for user NT-AUTORITÄT\Lokaler Dienst.

[Nuube]

I use Boomaga on an up-to-date MINT 19 Linux system and printing from Linux works perfectly.

From time to time I ran an Windows 10 inside a VirtualBox as a virtual system on the Linux host. Up until recently it worked flawless to share Bommaga over the network, install Boomaga inside the windows system and print from windows to Boomaga.

However this stopped working a couple of weeks ago. I am not sure if there was a MINT upgrade or a Boomaga upgrade shortly before stopping.

The print job from windows can be seen in Boomagas printer queue on the Linux host. But it is stopped with the error message "Can't get uid for user NT-AUTORITÄT\Lokaler Dienst.". When you check CUPS it shows the job with the same message.

Any advice?