Deploying a fresh fully updated Ubuntu 20.04 instance with gnome-shell downgraded to accommodate the agent install (VMware-horizonagent-linux-x86_64-2106-8.3.0-18285309), instant clone floating pool, it deploys VMs and names them in vCenter but ends up with a customization operation timed out for the VM status in Horizon. The VM also appears to not fully boot, it shows "sda assuming drive cache: write though" message then goes to blinking cursor. VMware tools is open-vm-tools-desktop, version 11360 installed from the repos, not using vGPU in this deployment.
We're on vCenter 7.0.3 build 18700403, hosts are 7.0.2 build 17867351.
I have a TSR open but response has been lackluster and many days between requests.
I had something similar for the 18.04, I ended up changing to the Logic SAS SCSI controller instead of the default paravirtual. With 20.04 I did the same as above, Logic SAS for controller, the system gets customized in vCenter, new IP, mac hostname, etc except that Horizon eventually times out with customization failed.