I have the same (or very similar) problem on a fresh 16.04 install (same
problem on 15.10 upgraded to 16.04, but I reinstalled to be sure).

Dell Latitude E4300

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07)
        Subsystem: Dell Mobile 4 Series Chipset Integrated Graphics Controller
        Kernel driver in use: i915
        Kernel modules: i915
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07)
        Subsystem: Dell Mobile 4 Series Chipset Integrated Graphics Controller

If I login with unity 8, I just get a black screen.  Interestingly,
sometimes I get a partially rendered desktop - however, I cannot get the
launcher to work, switching windows doesn't work, and in general
interacting with it is impossible.  Another odd thing is that if I do
this, after I login on lightdm, I am presented a different login screen
- the password text field isn't properly aligned either which is odd.

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https://bugs.launchpad.net/bugs/1549455

Title:
  Unity 8 doesn't load on Intel Pineview graphics [qtubuntu: ASSERT:
  "eglDestroyContext(mEglDisplay, mEglContext) == EGL_TRUE"]

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