I'm using miktex 4.2.1 on Ubuntu 20.04. When I tried to texdoc ctex, it came out the following errors:
Info: Running Texdoc not installed in the current TEXMFMAIN. /usr/bin/texdoc:41: module 'texdoclib' not found: no field package.preload['texdoclib'] [kpse lua searcher] file not found: 'texdoclib' [kpse C searcher] file not found: 'texdoclib'
And I'm new to Ubuntu, and couldn't figure it out. Can anybody help me?