Yes, the Operator Console (OC) can be installed on a Linux robot when all other components are installed on Windows.
1. Install a robot on the Linux server
2. Run the OC installer on the Primary hub and make sure you select the Linux robot.
IMPORTANT NOTE: You must use "SQL Authentication" for data_engine/UIM if you are connecting to a MSSQL database and not "Windows Authentication."
Windows Authentication requires the robot to be logged in to the system as a Domain User which has access to the database which is not possible on Linux robots.
Please also refer to the folllowing documents:
Component Support Matrix - DX UIM Compatibility Matrix
Official Documentation: Install Operator Console
Install Operator Console (OC) on Linux