I've been using Grive in Ubuntu 14.10, but after the upgrade to Ubuntu 15.10 the Google Drive app has been uninstalled automatically. How can I get it working again?
You need to install it again, it happened to me too. Follow the steps on webupd8 about installing, giving permission and syncing:
sudo add-apt-repository ppa:nilarimogard/webupd8 sudo apt-get update sudo apt-get install grive