Comment 9 for bug 1434396

I'm an ignorant on this, but, well... maybe somebody gets some info from this:

Syslog things:

Mar 26 22:54:21 UbuntuPruebasVirtual kernel: [ 5.247495] audit: type=1400 audit(1427406860.403:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session" pid=595 comm="apparmor_parser"

Mar 26 22:54:22 UbuntuPruebasVirtual lightdm[952]: Failed to use bus name org.freedesktop.DisplayManager, do you have appropriate permissions?
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service: main process exited, code=exited, status=1/FAILURE
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Unit lightdm.service entered failed state.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service failed.
Mar 26 22:54:22 UbuntuPruebasVirtual colord[940]: (colord:940): Cd-WARNING **: failed to get session [pid 840]: Error desconocido -2
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service holdoff time over, scheduling restart.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Cgroup management proxy.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting Restore /etc/resolv.conf if the system crashed before the ppp link was shut down....
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting Light Display Manager...
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Read required files in advance.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Restore /etc/resolv.conf if the system crashed before the ppp link was shut down..
Mar 26 22:54:22 UbuntuPruebasVirtual lightdm[1040]: Failed to use bus name org.freedesktop.DisplayManager, do you have appropriate permissions?
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service: main process exited, code=exited, status=1/FAILURE
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Failed to start Light Display Manager.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Dependency failed for Graphical Interface.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Job graphical.target/start failed with result 'dependency'.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Triggering OnFailure= dependencies of graphical.target.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Unit lightdm.service entered failed state.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service failed.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Stop ureadahead data collection 45s after completed startup.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting Terminate Plymouth Boot Screen...
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Cgroup management proxy.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting Restore /etc/resolv.conf if the system crashed before the ppp link was shut down....
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Restore /etc/resolv.conf if the system crashed before the ppp link was shut down..
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Received SIGRTMIN+21 from PID 251 (plymouthd).
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Wait for Plymouth Boot Screen to Quit.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Terminate Plymouth Boot Screen.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started X.org diagnosis failsafe.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting X.org diagnosis failsafe...
Mar 26 22:54:22 UbuntuPruebasVirtual colord-sane: [bjnp] create_broadcast_socket: bind socket to local address failed - Cannot assign requested address
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service holdoff time over, scheduling restart.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Requested transaction contradicts existing jobs: Transaction is destructive.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service failed to schedule restart job: Transaction is destructive.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Unit lightdm.service entered failed state.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: lightdm.service failed.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Created slice user-115.slice.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting user-115.slice.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting User Manager for UID 115...
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Started Session 1 of user sddm.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1]: Starting Session 1 of user sddm.
Mar 26 22:54:22 UbuntuPruebasVirtual systemd[1071]: Unit type .busname is not supported on this system.

and Xorg log:

[ 6.308] (II) Loading sub module "dri2"
[ 6.308] (II) LoadModule: "dri2"
[ 6.308] (II) Module "dri2" already built-in
[ 6.308] (II) UnloadModule: "modesetting"
[ 6.308] (II) Unloading modesetting
[ 6.308] (II) UnloadModule: "fbdev"
[ 6.308] (II) Unloading fbdev
[ 6.308] (II) UnloadSubModule: "fbdevhw"
[ 6.308] (II) Unloading fbdevhw
[ 6.309] (II) UnloadModule: "vesa"
[ 6.309] (II) Unloading vesa
[ 6.309] (==) Depth 24 pixmap format is 32 bpp
[ 6.309] (II) vmware(0): Initialized VMWARE_CTRL extension version 0.2
[ 6.311] (II) vmware(0): Gallium3D XA version: 2.2.0.
[ 6.311] (II) vmware(0): Path of drm device is "/dev/dri/card0".
[ 6.311] (II) vmware(0): [DRI2] Setup complete
[ 6.311] (II) vmware(0): [DRI2] DRI driver: vmwgfx
[ 6.311] (--) vmware(0): Render acceleration is enabled.
[ 6.311] (==) vmware(0): Rendercheck mode is disabled.
[ 6.311] (--) vmware(0): Direct rendering (3D) is enabled.
[ 6.311] (==) vmware(0): Direct presents are disabled.
[ 6.311] (==) vmware(0): Hardware only presents are disabled.
[ 6.311] (==) vmware(0): Backing store enabled
[ 6.311] (==) vmware(0): Silken mouse enabled
[ 6.311] (II) vmware(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 6.311] (==) vmware(0): DPMS enabled
[ 6.311] (--) RandR disabled
[ 6.315] (II) SELinux: Disabled on system
[ 6.318] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[ 6.318] (II) AIGLX: enabled GLX_ARB_create_context
[ 6.318] (II) AIGLX: enabled GLX_ARB_create_context_profile
[ 6.318] (II) AIGLX: enabled GLX_EXT_create_context_es2_profile
[ 6.318] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
[ 6.318] (II) AIGLX: enabled GLX_ARB_fbconfig_float
[ 6.318] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
[ 6.318] (II) AIGLX: Loaded and initialized vmwgfx
[ 6.318] (II) GLX: Initialized DRI2 GL provider for screen 0
[ 6.318] (EE)
Fatal server error:
[ 6.318] (EE) failed to create screen resources(EE)
[ 6.318] (EE)
Please consult the The X.Org Foundation support
  at http://wiki.x.org
 for help.
[ 6.318] (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[ 6.319] (EE)
[ 6.319] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 6.319] (WW) vmware(0): drmDropMaster failed: Invalid argument