Synergy One-to-Many Keymapping

#Overview I'm trying to map both Ctrl and Alt on Ubuntu to Cmd on MacOS. #Progress So far, I have only been able to map Ctrl **or** Alt, but not both. #Attempted Strategies In my .synergy.conf on the host (Ubuntu), I have tried the following: 1. Valid syntax, wrong results (only Ctrl), expected success: section: screens desktop: mac: ctrl = meta super = alt super = ctrl 2. Invalid syntax, reasonable strategy, expected success: section: screens desktop: mac: ctrl = meta super = ctrl, alt 3. Valid syntax, wrong results (only Ctrl), didn't expect success: section: screens desktop: alt = super mac: ctrl = meta super = ctrl 4. Invalid syntax, reasonable strategy, didn't expect success: section: screens desktop: mac: ctrl = meta super = (ctrl, alt) # Documentation I have failed to find helpful existing answers on SO , U&L SE, or elsewhere. I also read the official Ubuntu documentation .