I'm using Kubuntu 18.04, enter image description here
I had this same issue before. I noticed that, when ever I try to connect by WiFI it asks for the KDE Wallet password, and also had the same issue in getting connected with GoogleDrive. Then, I re-installed OS and I didn't see the KDE Wallet when connecting with WiFi; GDrive also connected OK.
After reinstallation of Kubuntu 18.04, the problem returns.
I gone through this, but the problem didn't get solved.