You don't need this package for bridging in Linux Mint; that can be managed in the "Network Connections" dialog. If you have two NICs, just set IPv4 of the one that *isn't* connected to the Internet to "Shared to other computers" rather that "Automatic (DHCP)". This isn't transparent bridging, but Internet works. Most wifi cards refuse to work with bridge-utils package btw.
very useful utility for bridging multiple ethernet interfaces together