Tested latest ISO from http://cdimage.ubuntu.com/impish/daily-canary/ (21.10.2021)
Box used for testing:
Dell [ Optiplex] MT 7060, i7-8700, 32 GB RAM, Intel HD Graphics 630, Intel i219 GB Ethernet, Samsung NVMe 256GB hd
Comments - UEFI+secure boot - full disk install - all went well - below times taken with stopwatch -
Boot to desktop - 2 min 46 seconds (very slow) the install 2 min 30 seconds after selecting user etc -
For comparison I also installed on the same box Impish released ISO -
boot to desktop - 1 min 8 seconds - install 4 min 32 seconds