Nope, the problem is still present in -proposed. Here's a more detailed
procedure of reproducing the bug:

- Do a clean Ubuntu install. I installed Ubuntu from the 16.04.3 desktop media 
to a VirtualBox VM.
- Do a "apt update && apt upgrade" as usual
- Per the instructions from <>, 
do what is told in the "Selective upgrading from -proposed" section.
- Add a stuck job to the CUPS queue. My way to do this is to add a network 
printer with URI "socket://". As the driver I used the "Generic PCL 
Laser". Now, print a test page.
- Now we should be able to pinpoint the packages we want to upgrade to 
-proposed. Run command "sudo apt -t xenial-proposed install cups-daemon"
- Now we have a broken packaging system. The command "sudo apt upgrade" will 

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  package cups-daemon 2.1.3-4 failed to install/upgrade: subprocess new
  pre-removal script returned error exit status 1

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