** Project changed: lightdm => lightdm (Ubuntu)
** Changed in: lightdm (Ubuntu)
Status: New => Triaged
** Changed in: lightdm (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/883175
Title:
Use update-alternatives(8) to set default greeter
Status in “lightdm” package in Ubuntu:
Triaged
Bug description:
This is a wishlist item for LightDM in Oneiric.
Currently, LightDM uses the /usr/lib/lightdm/lightdm-set-defaults
command for packages to change the default user session and greeter.
If unity-greeter is not installed, and /etc/lightdm/lightdm.conf
specifies the default (lightdm-gtk-greeter), then installing unity-
greeter will update the .conf file to use same by invoking the
aforementioned command in its postinst script. (Likewise, when unity-
greeter is removed, the prerm script sets things back the way they
were.)
This sort of behavior is already standardized in Debian/Ubuntu via the
update-alternatives(8) mechanism. I think it would be good to consider
using that infrastructure rather than rolling one's own. Presumably,
there would be a /usr/share/xgreeters/default-lightdm-greeter
alternative that points to whatever the "best" LightDM greeter is
installed; lightdm.conf would then specify "default-lightdm-greeter"
unless it has been manually modified by the user to use something else
explicitly.
Ideally, the same could be done for user-session, but this would
require all available sessions to be represented in the update-
alternatives system (not currently the case as I understand) and so
would be a larger project to coordinate.
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