It happened after I had to kill plasma and kwin because everything froze over an external wifi adapter. I found the answer here:
systemctl status systemd-homed
If it says something other than active, use
systemctl start systemd-homed
to start it again. After that I had my password working again.
My ssd had wouldn't unmount for unknown reasons, since everything that was using it was closed I was very surprised and annoyed. The error it would give me when I tried to unmount it in console was:
umount /run/media/user/ssd
Error unmounting block device 8:0: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/sda: target is busy
So I had to do (following this):
sudo lsof /dev/sda
That gave me the process that was "using" the hard. It was xdg-docum for a movie that was not playing or anything but apparently, the hard drive thought it was. So after I killed the process I could normally unmount it from Dolphin.
