If you updated to lnd 0.16 don't forget to change the routerrpc settings in the conf file, they changed the settings names and lnd won't start unless you do.

Look for the new ones in sample-lnd conf file on lnd GitHub.

They added the word "apriori" to the setting names for a few so refer to the link. This is an example.

routerrpc.apriori.hopprob=0.2

I believe this change is because they added a new probability estimator for pathfinding called bimodal. So some settings will be routerrpc.bimodal if you use the bimodal estimator.

https://github.com/lightningnetwork/lnd/blob/master/sample-lnd.conf