It just happened again:

$ ps -ef |grep dbus
103       2063     1  0 Feb13 ?        00:00:00 /usr/bin/dbus-daemon --system
root      2109  2107  0 Feb13 ?        00:00:00 dbus-daemon --session 
--print-address --nofork
user      2855  2751  0 Feb13 ?        00:00:00 /usr/bin/ssh-agent 
/usr/bin/dbus-launch --exit-with-session startxfce4
user      2858     1  0 Feb13 ?        00:00:00 /usr/bin/dbus-launch 
--exit-with-session startxfce4
user      2859     1  0 Feb13 ?        00:00:00 /usr/bin/dbus-daemon --fork 
--print-pid 4 --print-address 8 --session
user     18603 18499  0 00:03 pts/1    00:00:00 grep dbus

There is no dbus-session listed for the user. Any idea how to restart
it, by the way?

There is not a lot from network manager. This is the last (from
/var/log/daemon.log):

Feb 13 08:26:25 steel NetworkManager: <WARN>  nm_signal_handler(): Caught 
signal 15, shutting down normally. 
Feb 13 08:26:25 steel NetworkManager: <info>  Caught terminiation signal 
Feb 13 08:26:25 steel NetworkManager: <debug> [1202887585.069387] 
nm_print_open_socks(): Open Sockets List: 
Feb 13 08:26:25 steel NetworkManager: <debug> [1202887585.069447] 
nm_print_open_socks(): Open Sockets List Done. 
Feb 13 08:26:25 steel NetworkManager: <info>  Deactivating device wlan0. 
Feb 13 08:26:25 steel rpc.statd[1595]: Caught signal 15, un-registering and 
exiting.
Feb 13 08:26:27 steel mountd[2330]: Caught signal 15, un-registering and 
exiting.
Feb 13 18:33:16 steel NetworkManager: <info>  starting... 
Feb 13 18:33:17 steel NetworkManager: <info>  wlan0: Device is fully-supported 
using driver 'rt2500pci'. 
Feb 13 18:33:17 steel NetworkManager: <info>  nm_device_init(): waiting for 
device's worker thread to start 
Feb 13 18:33:17 steel NetworkManager: <info>  nm_device_init(): device's worker 
thread started, continuing. 
Feb 13 18:33:17 steel NetworkManager: <info>  Now managing wireless (802.11) 
device 'wlan0'. 
Feb 13 18:33:17 steel NetworkManager: <info>  Deactivating device wlan0. 
Feb 13 18:33:17 steel NetworkManager: <debug> [1202923997.763417] 
nm_hal_device_added(): New device added (hal udi is 
'/org/freedesktop/Hal/devices/storage_model_DVD_A__DH20A1S').

-- 
"Shutdown" and "Restart" buttons disabled in XFCE shutdown dialog
https://bugs.launchpad.net/bugs/190312
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