Platform
Raspberry PI running Raspbian GNU/Linux 10 (buster)

Issue
sudo marathon install my-script fails with error output:

🏃  Compiling script...
💥  Failed to compile script
👉  The following error(s) occured:
   - 1:8: no such module 'ShellOut'
👉  You can add ShellOut to Marathon using 'marathon add <url-to-ShellOut>'

Steps to reproduce

• Install marathon as described (for Linux) in readme
• Install Shellout module with marathon add <url-to-ShellOut>
• Create script that imports ShellOut
• Try to install that script

Notes

• Interestingly marathon run my-script works just fine with script that uses ShellOut module
• marathon list shows that ShellOut module is installed indeed
• Installing a script without dependencies works correctly