I am trying to install Ubuntu-Mate 20.04.1 (ubuntu-mate-20.04.1-desktop-armhf+raspi.img.xz) on my Pi 3, but the first boot hung shortly after completing resizing of the SD card partition 2 -- see https://www.mediafire.com/view/rjw3io8675urqcv/20210311_102808%255B1%255D.jpg/file and https://www.mediafire.com/view/qapdzzxb084ih6z/20210312_082244%255B1%255D.jpg/file.
FWIW the Pi 3 can boot Raspian Buster as well as Ubuntu-Mate 18.04 Beta 1 and 20.10 without any issue.
Any pointer would greatly be appreciated.
TIA.