The patch at 81833a1c is necessary on an arm64 system running librtlsdr-dev, otherwise you get the error
Reading samples in async mode...
Allocating 15 zero-copy buffers
Killed
This is fixed in Debian Sid in a version labelled 0.6.0-3. Unfortunately, there is also a Ubuntu 20.04 version of the library also labelled 0.6.0-3 which has the bug - noted on Launchpad as 1876624.
The workaround I did was to install the .deb file from Sid on top of my Ubuntu 20.04 installation, which I hope to undo as soon as I can. It also worked to build that library from source.
Other than that, my experience with Ubuntu 20.04 on the Pi 4 running arm64 has been just fine. I'm looking forward to updating the rest of my Pi menagerie, some of which is stuck on old Debian Jessie.
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