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After upgrading packages on a Fedora 30 system around the 30th May, any action that requires a credential check (sudo, su, login screen etc) takes about 30 seconds to appear.

This seems to be a problem with a dbus timeout trying to talk to the fingerprint daemon (more details in the additional details section).

Workaround was to disable fingerprint as a valid login method using authconfig.

Reproducible: Always

Steps to Reproduce:
1.Issue any command that has a password challenge (sudo, su, login etc)
2.
3.
Actual Results:  
Password prompt takes ~30 seconds to appear

Expected Results:  
Password prompt comes up immediately

Upgraded from F29 to F30 and all was find for a while.
About a week ago after an upgrade, i noticed that sudo was taking a long time to get to ask me for a password.  Also it was taking a long time to go from suspend to a login screen.

A quick check with 'strace su -', it looked like the problem was a timeout on a dbus call to an Fprint.xx endpoint.

I am running this on a dell xps13, which I don't believe has a fingerprint reader.

Solution to the problem was to use
  authconfig --disablefingerprint --updateall

and everything is fine again.