This bug was fixed in the package lightdm - 1.19.1-0ubuntu1
---------------
lightdm (1.19.1-0ubuntu1) yakkety; urgency=medium
* New upstream release:
* debian/lightdm.dirs:
- Rename "xlocal" seat type to "local". Using "xlocal" will continue to work
but report a warning.
- Ensure user configuration directories /etc/lightdm/lightdm.conf.d and
/etc/guest-session exist
- Use MIR_SERVER_HOST_SOCKET instead of MIR_SOCKET to report compositor
socket to sessions. This used to work but no longer works in Mir 0.21
(LP: #1583624)
- Allow XMir to run on the xlocal seat using the new x-server-backend=mir
option
- Use only a single compositor on local seats (LP: #1594229)
- Fix Mir greeter log filename having "(null)" in the name (LP: #1590582)
- Copy fcitx/mozc rules so session works when these aren't installed
(LP #1581187)
- Revert lxsession change - it caused the AppArmor to fail to compile
* debian/rules:
- Revert dh_installinit change - we don't want to start LightDM on install
(LP: #1581106)
* debian/guest-account.sh:
* debian/guest-session-setup.sh:
- Source prefs.sh as privileged user to allow user modification
(LP: #1581853)
-- Robert Ancell <robert.anc...@canonical.com> Mon, 20 Jun 2016
16:18:36 +1200
** Changed in: lightdm (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1581853
Title:
Source prefs.sh as privileged user to allow user mods
Status in lightdm package in Ubuntu:
Fix Released
Status in lightdm source package in Xenial:
In Progress
Bug description:
[Impact] including [Test Case]
The Ask Ubuntu question <http://askubuntu.com/q/771080> called my
attention to a regression in 16.04 as regards the possibilities for
the system owner to configure the guest account. Up to 15.10 you can
put e.g. this line in /etc/guest-session/prefs.sh:
adduser $USER somegroup
But if you try that in 16.04, the guest session won't launch. The
explanation is that after the reorganization of the guest session code
in 16.04, prefs.sh is sourced by /usr/share/lightdm/guest-
session/setup.sh, which is not run as root.
The linked merge proposals restore the previous behavior by letting
prefs.sh be sourced by /usr/sbin/guest-account again.
[Regression Potential]
Low.
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