As @hurdad mentioned : 32-bit OS the script keeps trying to install lib32gcc1... which doesn't exist in 32bit OS.
/ts3server start
[ WARN ] Starting ts3-server: Checking dependencies: Dependency missing: lib32gcc1
[ INFO ] Starting ts3-server: Attempting to install missing dependencies automatically
sudo dpkg --add-architecture i386; sudo apt-get install lib32gcc1
As @hurdad mentioned : 32-bit OS the script keeps trying to install lib32gcc1... which doesn't exist in 32bit OS.