I did an update yesterday (4th December 2018) and found few problems that most sorted out themselves.
First, half way the update I got a black screen and had to login again after a while, than had to conclude the update and everything was working, so no real problem here, but wanted to let you know what happened.
Then, this package: cups-pk-helper-0.2.6-2 was not installed properly.
This was my first error:
error: could not open file /var/lib/pacman/local/cups-pk-helper-0.2.6-2/desc: No such file or directory
Then I looked for some solution and reinstall it was one of the suggestions. So tried that to discover that the package has 0 Byte size.
(By the way: Pamac on right click on an installed package does not have the “Reinstall” option)
And last I now have these warning, which I’m not expecting to have:
Warning: lib32-systemd: local (239.303-1) is newer than multilib (239.6-2) Warning: libsystemd: local (239.303-1) is newer than core (239.6-2) Warning: systemd: local (239.303-1) is newer than core (239.6-2) Warning: systemd-sysvcompat: local (239.303-1) is newer than core (239.6-2)
Cups-pk-helper is the only real problem I suspect.