Using a RPI 3B, I did a clean install of UM 16.02 from UM website, resized the boot partition, updated 16.04 to 16.04.5.
Used the suggested software update program and after many hours had 18.04 running. At the end the boot partition
only used 22MB so it seemed like increasing the boot partition was not needed. (normally 63MB increased to 276MB, 254MB free, 8% used)
I then put the 18.04 mSD card into RPI 3B+and it hung at the rainbow screen, as per usual.
IT would appear that the fix suggested by SuperOz31 does work for an RPI 3B BUT does not work for a RPI 3B+!!
Any suggestions by someone using an RPI 3B+ ?
Please just give us some feedback on:
A) that someone is actually working on an 18.04 raspberrypi release
B) if so, approximately when will it be released