Does Ubuntu 20.04 nginx support range requests?

It implies in [https://docs.nginx.com/nginx/admin-guide/content-cache/content-caching/][1] that nginx supports range requests only if Cache Slicing is compiled into nginx.

Does Ubuntu 20.04 nginx support range requests?

I guess nginx-extras and nginx-full package should have it (at least has it in debian).

But you could find it out by yourself:

?sudo? nginx -V 2>&1 | tr " " "\n" | grep slice

BTW, cache slicing is only necessary if you want support range request in dynamic (e. g. proxying) content. Moreover it is used to split or else to implement effective cache of big response in chunks, which are under your control on proxying side.
For a simple range request to static resource (e. g. clients accessing PDF files or archives) it is not needed at all, nginx can serve Range: bytes=n-m request without any issue.

Just try this to test it:

curl -v -r 0-1000 --HEAD 'http://example.com/download/some-file.pdf'

and see whether it'd answer with 206 Partial Content.

In this way you can even do it for any dynamic content without slice module too, e. g. using HTTP redirect to previously stored file in some download location "caching" your documents internally in one piece.
And ngx_http_slice_module is something for partial caching e. g. for splitting a large response in few small responses behind backend upstream.