I created a program called KnockKnock to convert ACSM files to DRM-free EPUB files at the command line:
[user@computer:~]$ knock ./example.acsm
downloading the file from Adobe...
removing DRM from the file...
DRM-free EPUB file generated at ./example.epub
It doesn't use Adobe Digital Editions and it doesn't use Wine. It is completely free and open-source software for native Linux.