Why installing openssh-server would remove openssh-client?

I face the following situation on one machine with 64bit Mint 17.3 Cinnamon: **$ sudo apt-get install openssh-server** Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: openssh-client:i386 openssh-sftp-server Suggested packages: ssh-askpass:i386 libpam-ssh:i386 keychain:i386 monkeysphere:i386 rssh molly-guard monkeysphere Recommended packages: ncurses-term ssh-import-id The following packages will be REMOVED: openssh-client The following NEW packages will be installed: openssh-client:i386 openssh-server openssh-sftp-server 0 upgraded, 3 newly installed, 1 to remove and 0 not upgraded. Need to get 928 kB of archives. After this operation, 1 418 kB of additional disk space will be used. Do you want to continue? [Y/n] n Abort. I don't understand why it wants to remove the 64bit openssh-client and install 32bit instead. **/etc/apt/sources.list** #deb cdrom:[Linux Mint 17.3 _Rosa_ - Release amd64 20151115]/ trusty contrib main non-free **/etc/apt/sources.list.d folder contains many PPAs:** doublecmd.list esmska.list getdeb.list google-chrome.list graphics-drivers-ppa-trusty.list inkscape_dev-stable-trusty.list mono-xamarin.list nijel-phpmyadmin-trusty.list n-muench-programs-ppa2-trusty.list official-package-repositories.list official-source-repositories.list ondrej-php-trusty.list otto-kesselgulasch-gimp-trusty.list playonlinux.list spideroakone.list spotify.list steam.list strukturag-libde265-trusty.list ubuntu-sdk-team-ppa-trusty.list ubuntu-touch-coreapps-drivers-daily-trusty.list unit193-encryption-trusty.list videolan-master-daily-trusty.list virtualbox.list wfg-0ad-trusty.list wine.list **apt-get update** Reading package lists... Done I can see no errors. **apt-get -o Debug::pkgProblemResolver=true install openssh-server** Reading package lists... Done Building dependency tree Reading state information... Done Starting pkgProblemResolver with broken count: 0 Starting 2 pkgProblemResolver with broken count: 0 Done The following extra packages will be installed: openssh-client:i386 openssh-sftp-server Suggested packages: ssh-askpass:i386 libpam-ssh:i386 keychain:i386 monkeysphere:i386 rssh molly-guard monkeysphere Recommended packages: ncurses-term ssh-import-id The following packages will be REMOVED: openssh-client The following NEW packages will be installed: openssh-client:i386 openssh-server openssh-sftp-server 0 upgraded, 3 newly installed, 1 to remove and 0 not upgraded. Need to get 928 kB of archives. After this operation, 1,418 kB of additional disk space will be used. Do you want to continue? [Y/n] n Abort. **apt-cache policy openssh-client openssh-server** openssh-client: Installed: 1:6.6p1-2ubuntu2.6 Candidate: 1:6.6p1-2ubuntu2.6 Version table: *** 1:6.6p1-2ubuntu2.6 0 100 /var/lib/dpkg/status 1:6.6p1-2ubuntu2.4 0 500 http://archive.ubuntu.mirror.dkm.cz/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 1:6.6p1-2ubuntu1 0 500 http://archive.ubuntu.mirror.dkm.cz/ trusty/main amd64 Packages openssh-server: Installed: (none) Candidate: 1:6.6p1-2ubuntu2.4 Version table: 1:6.6p1-2ubuntu2.4 0 500 http://archive.ubuntu.mirror.dkm.cz/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 1:6.6p1-2ubuntu1 0 500 http://archive.ubuntu.mirror.dkm.cz/ trusty/main amd64 Packages