Among Us Linux Steam. Select the entry steam-installer. Around 200k of us.
Synaptic will pop up a dialog box showing the additional dependencies that will be installed alongside Steam. Find the STORE button and select it to load up the Steam Storefront page. Basically I installed mods as usual as if I was a Windows user.
Had no issues playing modded Among Us with Windows users.
Click the Search button and use the term steam without quotes. Google still classifies Linux support as beta and its not available on all. Extract the file and transfer its contents to the Linux Files directory. On the Among Us Storefront page.