I am failing to reliably reproduce this issue.
At first I have experienced this too. When I tried to bisect it and install 
multiple kernel abis they are all booting fine.

So I was able to fail booting 1014 1015 1016 abis. And then they started
to boot fine.

I wonder if there is some requirements in terms of cold boot; hard
reset; soft boot. Or if the SD-card is like busted, and comes back to
life if one writes the kernel image to a different location based on
wear leveling.

At the moment we are preparing for point release of Ubuntu 20.04 with
unmatched support. It currently has the 1015 abi too.

If you can, it would be nice if people can test Unmatched image from
https://cdimage.ubuntu.com/ubuntu-server/focal/daily-
preinstalled/pending/ and report if it is working for them or not.

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https://bugs.launchpad.net/bugs/1934548

Title:
  RISC-V: Illegal instruction

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