I am trying to upgrade pods on GKE and receiving this error:
The request contains invalid arguments: "EXTERNAL: bad desired node version (1.7.6-gke.1).". Error code: "7"
The pods are running version 1.7.5
This appears to be a bug in allowing 1.7.6-gke.1 as a node version. For me, selecting 1.7.6 upgraded correctly.