This worked for my botched CUC 11.5 SU5 after a reboot did a vmware tools upgrade and failed. I was missing the script in my active partition, copying all files over (including the script) to the active and running it after chrooting fixed my no-boot. Thanks!
This solved quickly the same issue for me in 11.5, thanks!
I disable the auto update method and did it manually, safer due to this bug.