A big hammer solution:
[root@quaco ~]# rpm -e fprintd fprintd-pam
[error] [/etc/nsswitch.conf] is not a symbolic link!
[error] [/etc/nsswitch.conf] was not created by authselect!
[error] Unexpected changes to the configuration were detected.
[error] Refusing to activate profile unless those changes are removed or overwrite is requested.
Unable to disable feature [17]: File exists
[root@quaco ~]#
The warnings are not that reassuring, trying to use authselect to check the config also doesn’t bring extra confidence:
[root@quaco ~]# authselect check
[error] [/etc/nsswitch.conf] is not a symbolic link!
[error] [/etc/nsswitch.conf] was not created by authselect!
Current configuration is not valid. It was probably modified outside authselect.
The fprintd is still in the config files:
[root@quaco ~]# grep fprintd /etc/pam.d/system-auth
auth sufficient pam_fprintd.so
[root@quaco ~]#
But since it is not installed, I get my fast sudo again, back to work.