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Bug#765803: tech-ctte: Ask before changing init system when upgrading to jessie and Inform about init systems when installing jessie

Package: tech-ctte
Severity: Important

When upgrading an old system installing certain packages, like
network-manager and gdm3 systemd-sysv is installed changing the init
system. These packages depend on libpam-systemd, which depends on
systemd-sysv | systemd-shim. If systemd-shim is not installed
systemd-sysv will be, and the init system changes the default to
systemd-sysv, and changing PID 1.

Changing init system, i.e. PID1, should be warned about loudly by
debconf. Not all users want to change init system when doing and
upgrade, of course this should not happen (sometimes unnoticed by
upgrading a lot of packages).

For new installations the situation is different, systemd is the
default init system. Nevertheless, perhaps even for new installations
the user should be given a choice. At least on how to reinstall
sysvinit-core after installing the default init system: systemd-sysv in
the Debian Installer (DI) (if not solvable by other means in the DI). 

The bug on (and the discussion there) on systemd-sysv:
has ping-ponged in severity and the systemd maintainers always downgrade
the severity to wishlist and tagged it wontfix. The only way to resolve
this issue is that the CTTE makes a decision on this matter.

Other bugs related to this issue are: 760601 764186 746578

In summary, the CTTE is asked to make a decision on debconf warnings on:
1) Changing init system on upgrades (including sid)
2) Inform about alternate init systems for new installations

Thank you for your attention!

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