How to remove systemd from a Debian jessie/sid installation

From Without Systemd
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First install the SysV init packages

# apt-get install sysvinit-core sysvinit sysvinit-utils

Then reboot your machine and remove all of the systemd packages. BE AWARE that the following command removes packages that depend on systemd itself or things like libpam-systemd!

# apt-get remove --purge --auto-remove systemd

Prevent apt from installing systemd packages in the future.

# echo -e 'Package: systemd\nPin: origin ""\nPin-Priority: -1' > /etc/apt/preferences.d/systemd

Prevent apt from installing any systemd like packages in the future (note the star before and after systemd)

# echo -e '\n\nPackage: *systemd*\nPin: origin ""\nPin-Priority: -1' >> /etc/apt/preferences.d/systemd

Note: This prevents the installation of the package systemd-shim as well. However this is a emulation of systemd functions, so you can install software which depends on systemd. So if you get "Package systemd-shim is not available, but is referred to by another package." you might temporary disable the three lines in the preferences.d/systemd file.

In the case your system uses multiarch (mixed 32 and 64bit packages), you need to pin the 64bit version of systemd too. Otherwise apt-get could still install it as dependency later.

# echo -e '\nPackage: systemd:amd64\nPin: origin ""\nPin-Priority: -1' >> /etc/apt/preferences.d/systemd

In other multiarch cases where amd64 is the default architecture, you may have to pin the i386 package to prevent APT from installing it:

# echo -e '\nPackage: systemd:i386\nPin: origin ""\nPin-Priority: -1' >> /etc/apt/preferences.d/systemd
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