dataloader: SWT runtime error on Linux - "Unable to find SWT jar for Linux : amd64"

Excited to see work on a Linux build! Been trying to get it working, but no success yet.

Linux Mint 20 OpenJDK Runtime Environment Zulu11.52+13-CA (build 11.0.13+8-LTS) SWT 4.21

Followed readme build steps (success), extracted contents of dataloader_linux.zip, and ran script:

./dataloader.sh
Unable to find SWT jar for Linux : amd64

Tried directly and with classpath, same error:

java -jar dataloader-53.0.1-uber.jar
Unable to find SWT jar for Linux : amd64

java -cp "swtlinux_x86_64/*" -jar dataloader-53.0.1-uber.jar
Unable to find SWT jar for Linux : amd64

Updated SWT to 4.22 using the python script and re-built. New swt files but same error.

Had a java dev take a look, his comments were:

1. The uber jar has no dependency jars in it
2. Using Maven to control the classpath gives the same error mvn clean compile -Plinux_x86_64 exec:java -Dexec.mainClass="com.salesforce.dataloader.process.DataLoaderRunner"

HTH