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by excalibur 2787 days ago
Looks like the original "unrar" has some licensing restrictions (for compression purposes, not decompression). The "unrar-free" version was created as pure FOSS in response, but the performance isn't quite up to par. If there are any compatibility issues, it's likely the latter version that's having them. No idea what "unrar-nonfree" is, I'm guessing it's just another name for the first "unrar".

https://ubuntuforums.org/showthread.php?t=2012979