After you uninstall Update Manager server, the Update Manager tab might remain visible under the Monitor tab in the vSphere Web Client.
The Scan and Attach buttons appear active, but if you click them, the following error message appears:
There was an error connecting to VMware vSphere Update Manager.
Also after uninstallation of Update Manager server, the Update Manager installation directory might still contain files. This does not affect future installations of Update Manager.
The Update Manager tab disappears from the Monitor tab in the vSphere Web Client.