This bug was fixed in the package lightdm - 1.18.2-0ubuntu1
---------------
lightdm (1.18.2-0ubuntu1) xenial; urgency=medium
* New upstream release:
- Don't quit on SIGUSR1, SIGUSR2 or SIGHUP (LP: #960157)
- 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)
- Use only a single compositor on xlocal seats (LP: #1594229)
- Fix Mir greeter log filename having "(null)" in the name (LP: #1590582)
- Set XDMCP hostname field in to system hostname or configured value
(LP: #1578442)
- Improve XDMCP IPv6 address selection (LP: #1575200)
- Allow fcitx and mozc to run in guest session (LP: #1509829)
- Fix uninitialized memory errors
* debian/lightdm.dirs:
- Ensure user configuration directories /etc/lightdm/lightdm.conf.d and
/etc/guest-session exist
* 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> Tue, 21 Jun 2016
12:49:01 +1200
** Changed in: lightdm (Ubuntu Xenial)
Status: Fix Committed => 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:
Fix Released
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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