lightdm: error found when loading /root/.profile

[DLCBurggraaff]

Lightdm on Ubuntu 16.04, also with Ubuntu-Mate 16.04 and Xubuntu 16.04 but *not* with Lubuntu 16.04

When logging in via Other > root a popup is shown reading:
-- Error found when loading /root/.profile
-- mesg: ttyname failed: Inappropriate ioctl for device
-- As result the session will not be configured correctly.
-- You should fix the problem as soon as feasible.

After pressing OK the session is started without problems.

Alternatively logging in via <Ctrl+Alt+F2> as root and issuing "startx -- :1" succeeds without problems.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
CurrentDesktop: Unity
Date: Sun May 22 15:58:45 2016
LightdmConfig:
 [SeatDefaults]
 allow-guest=false
 autologin-guest=false
 autologin-user=ubuntu
 autologin-user-timeout=0
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[DLCBurggraaff (burdi)]

Resolved with 16.04.1

[Sebastien Bacher (seb128)]

closing if it's resolved, thanks