Comment # 3 on bug 1050953 from Fabian Vogt

(In reply to Freek de Kruijf from comment #2)
> Without systemsettings5 running I got the following.
> 
> freek@ltfctum:~> qdbus-qt5 --system --literal org.freedesktop.Accounts
> /org/freedesktop/Accounts org.freedesktop.Accounts.ListCachedUsers
> [Argument: ao {}]
> freek@ltfctum:~> qdbus-qt5 --system --literal org.freedesktop.Accounts
> /org/freedesktop/Accounts org.freedesktop.Accounts.ListCachedUsers $USER
> Invalid number of parameters

This needs to be CacheUser, not ListCachedUsers.