In plasma 6, while pamac cli works fine, pamac gui is failing. This is happening since a couple of days.
I need to kill the gui, then unlock pacman db rm /var/lib/pacman/db.lck, then finally launch the cli in the konsole. I can’t see this error reported, so maybe it is just me.
For one thing, the screenshots indicate that your system has not been properly maintained, as you still have the long-gone Community repo in your configuration. I recommend that you install the pacman-contrib package, and then run pacdiff -o to see if you have .pacnew files that need to be actioned.
I realise this may not be related to the issue you are currently experiencing with Pamac, however failing to deal with .pacnew (and .pacsave) files will most likely cause problems with your Manjaro installation.
Firefox translation plugin does not work on screenshots
Screenshots show multiple package managers/AUR helpers in use
Screenshot for pamac upgrade suggests AUR support is enabled
To update repository packages only:
pamac update --no-aur
Ctrl+C is likely to cause a problem with pacman database lock on any package manager
Better to wait and select N when requested to apply transaction (Aplicar transacción)