Right after the boot, while Plasma is starting, the policy kit (PolKit1) wants to mount a partition, and asks root’s password for that.
I don’t want that partition to be mounted. There is nothing said about the partition in fstab.
In System Settings -> Removable Storage -> Removable Devices -> Device Overrides, the partition is neither listed to be automounted at login nor to be automounted on attach (all boxes are unchecked in the table).
There are other partitions in the computer, which policy kit does not want to mount.
How can I disable that undesirable behavior of the policy kit? I haven’t configured it in any way.