I was stuck for a while trying to update from 10.13.1, but finally managed to resolve it all and reach 10.13.3.
Initially the problem was my machine would stall after restarting for the update and launching from the "Install Mac OS X" option. It wouldn't begin the actual installation, so it would allow my machine to restart and continue functioning.
Verbose mode revealed progress stopped at:
kextd stall[3], (240s): 'AppleACPICPU'
IOConsoleUsers: time(0_ 0->0, lin 0 lik 1,
IOConsoleUsers: gIOScreenLockState 3, hs 0, bs 0, now 0, sm 0x0
In the process of troubleshooting, I updated Lilu.kext, NvidiaGraphicsFixup.kext and updated Clover without resolving the issue. The issue was completely solved by properly including FakeSMC.kext in the clover part of the EFI partition, as mentioned in the first post of this thread.
(I decided it was worth posting because I noticed the solution as merely one of several trouble-shooting options. I didn't find an explicit connection between this error and this solution when I was searching for it.)