I recently ran in to an issue where the vCenter server appliance update timed out. Rebooting the vCenter server brought the server back up but i was unable to log in to the administration section due to an Update installation in progress error
Doing some research i found that there is a file that holds this information fount at /etc/applmgmt/appliance/software_update_state.conf At this point all i had to do was edit the file using vi
vi /etc/applmgmt/appliance/software_update_state.conf
When opening the file i noticed that the state was INSTALL_IN_PROGRESS
Tge version was also different from what the console was showing
So i updated the file to reflect the actual version of the appliance. The end result looked like this: