System crash after Update from 20.1 to 20.7

[GarryG]

Tonight I decided to update from my 20.1 VM to 20.7 ... after quite a while (system isn't the fastest I/O-wise) the system booted just fine ... until about 20 seconds later an dozens of errors on the console later, it crashed ... rebooted, came up, next crash ...
I wasn't able to actually get any logs or debugs from the system as it wouldn't stay up long enough ... as I had already had my servers down too long for the update, I decided to just do a rollback to the snapshot ... Before I did, I downloaded the 20.7 config file, and will try to do a clean install of the 20.7 image and load the config, see if that works better ...
Does anybody have an idea if there is some known issue when doing the 20.1->20.7 issue?

(P.S. - running 20.1.9_1 at the moment)

[Irrelevant]

Are you running this on an ESXi host? I had the same problem which required me to "disconnect" the virtual interfaces apart from my WAN connection, I then performed an update from the shell to 20.7.2 which solved the problem. The fault occurred with 20.7 not liking the VDS being in promiscuous mode.