It looks like libfreetype6-dev and libfreetype6-dev:i386 are simply not co-installable:
LANGUAGE=en_US.UTF-8 sudo apt-get install libfreetype6-dev libfreetype6-dev:i386 Reading package lists... Done Building dependency tree Reading state information... Done libfreetype6-dev is already the newest version. libfreetype6-dev set to manually installed. Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libfreetype6-dev : Conflicts: libfreetype6-dev:i386 but 2.4.8-1 is to be installed libfreetype6-dev:i386 : Conflicts: libfreetype6-dev but 2.4.8-1 is to be installed E: Unable to correct problems, you have held broken packages. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/911965 Title: libfreetype6-dev:386 cannot be installed without removing gcc To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/freetype/+bug/911965/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs