Here is something, that may be interesting in /var/log/messages:
Apr  5 16:32:01 dmig-desktop kernel: [12408.884911] gdm-session-wor[2825] 
general protection ip:7f7c8f0abe76 sp:7fffe49a50d0 error:0 in 
libhal.so.1.0.0[7f7c8f0a0000+10000]
Apr  5 16:32:02 dmig-desktop pulseaudio[18540]: pid.c: Stale PID file, 
overwriting.
Apr  5 16:32:06 dmig-desktop pulseaudio[18540]: main.c: Unable to contact 
D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket 
/tmp/dbus-yyr0RB5l1c: В соединении отказано
Apr  5 16:32:08 dmig-desktop kernel: [12415.771854] usb 2-4: USB disconnect, 
address 6

And this appears in Xorg.0.log:
(EE) DoSwapInterval: cx = 0x2e7b5c0, GLX screen = 0x2616db0

-- 
Xorg crashes on usb storage unmount/disconnect
https://bugs.launchpad.net/bugs/553190
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