libtiff-dev and libtiff-dev:i386 cannot be installed on ubuntu 18.04

[Volo Zyko]

I experimented with Ubuntu 18.04 docker image from hub.docker.com. After usual 'dpkg --add-architecture i386 && apt update && apt upgrade' I tried to install both libtiff-dev and libtiff-dev:i386 and got a conflict.

root@6ac67a0fc2a8:/# apt-get install libtiff-dev libtiff-dev:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
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:
 libtiff-dev : Conflicts: libtiff-dev:i386 but 4.0.9-5ubuntu0.4 is to be installed
 libtiff-dev:i386 : Conflicts: libtiff-dev but 4.0.9-5ubuntu0.4 is to be installed
E: Unable to correct problems, you have held broken packages.

When I tried the same commands on Ubuntu 20.04 they worked without a problem.