** Description changed:

+ [Impact]
  Recent libgl-mesa 18.0.5-0ubuntu0~16.04.1 graphics update prevents
  drop down list menu appearing in apps like firefox three line/bar menu
  After recently applying updates, left clicking on some application
  menus and icons no longer displays a drop-down menu list.
  For example in Firefox when I left-click on the **three line/bar**
  icon in the upper right-hand corner, the normal drop down list menu
  does not display.  Also the menu drop down doesn't display in
  keypassx.  Further xchat-gnome doesn't even display a window.
  Another anomaly is that my KDE bottom menu bar changed to a dark
+ [Test case]
+ Install the update, log in and check that things work normally again
+ [Regression potential]
+ none, this just prevents a premature feature to kick in
+ [Other info]
  I'm using Kubuntu 16.04 on an Intel i7-7700k computer with Intel HD
  Graphics.  I have KDE **System Settings -> Compositor** enabled with:
-    Scale method          :        Accurate
-    Rendering backend:             OpenGL 3.1
-    OpenGL interface:              GLX
-    Tearing prevention ("vsync"):  Full screen repaints
-    Keep window thumbnails:        Only for Shown Windows
+    Scale method          :        Accurate
+    Rendering backend:             OpenGL 3.1
+    OpenGL interface:              GLX
+    Tearing prevention ("vsync"):  Full screen repaints
+    Keep window thumbnails:        Only for Shown Windows
  After several hours of searching the Internet I found one other case
  of a similar problem.
-    Firefox's Menu Bar won't open
-    https://support.mozilla.org/en-US/questions/1194760
+    Firefox's Menu Bar won't open
+    https://support.mozilla.org/en-US/questions/1194760
  The reported solution was to rollback the graphics drivers.
  Because the issues cropped up after applying updates on July 6, 2018,
  I tracked down the list of recent updates with:
-    grep -A 2 'Start-Date: 2018-07-06' /var/log/apt/history.log | tail -1
+    grep -A 2 'Start-Date: 2018-07-06' /var/log/apt/history.log | tail -1
  After some editing to place packages on separate lines, and
  identifying the grahics libraries, I arrived at the following list:
  libgles2-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libglapi-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libglapi-mesa:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libxatracker2:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libegl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libgbm1:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libwayland-egl1-mesa:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libgl1-mesa-dri:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libgl1-mesa-dri:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libosmesa6:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libosmesa6:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libgl1-mesa-glx:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  libgl1-mesa-glx:i386 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  mesa-vdpau-drivers:amd64 (17.2.8-0ubuntu0~16.04.1 18.0.5-0ubuntu0~16.04.1)
  To revert to the prior graphic drivers I tracked down the '.deb'
  packages for each of the above packages and downloaded the
  '17.2.8-0ubuntu0~16.04.1' version.
  For example:
  I also discovered that some of these depended on
  libllvm5.0_5.0-3~16.04.1 so I also downloaded the following files:
-   libllvm5.0_5.0-3~16.04.1_amd64.deb
-   libllvm5.0_5.0-3~16.04.1_i386.deb
+   libllvm5.0_5.0-3~16.04.1_amd64.deb
+   libllvm5.0_5.0-3~16.04.1_i386.deb
  Install older versions with:
  sudo dpkg -i \
-   libllvm5.0_5.0-3~16.04.1_amd64.deb \
-   libllvm5.0_5.0-3~16.04.1_i386.deb \
-   libegl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libgbm1_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_i386.deb \
-   libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_i386.deb \
-   libglapi-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libglapi-mesa_17.2.8-0ubuntu0~16.04.1_i386.deb \
-   libgles2-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libosmesa6_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libosmesa6_17.2.8-0ubuntu0~16.04.1_i386.deb \
-   libwayland-egl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   libxatracker2_17.2.8-0ubuntu0~16.04.1_amd64.deb \
-   mesa-vdpau-drivers_17.2.8-0ubuntu0~16.04.1_amd64.deb
+   libllvm5.0_5.0-3~16.04.1_amd64.deb \
+   libllvm5.0_5.0-3~16.04.1_i386.deb \
+   libegl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libgbm1_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libgl1-mesa-dri_17.2.8-0ubuntu0~16.04.1_i386.deb \
+   libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libgl1-mesa-glx_17.2.8-0ubuntu0~16.04.1_i386.deb \
+   libglapi-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libglapi-mesa_17.2.8-0ubuntu0~16.04.1_i386.deb \
+   libgles2-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libosmesa6_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libosmesa6_17.2.8-0ubuntu0~16.04.1_i386.deb \
+   libwayland-egl1-mesa_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   libxatracker2_17.2.8-0ubuntu0~16.04.1_amd64.deb \
+   mesa-vdpau-drivers_17.2.8-0ubuntu0~16.04.1_amd64.deb
  After rebooting, all the issues disappeared.
  For example I was once again able to left-click on the Firefox **three
  line/bar** menu and view the drop down list menu.  Also the KDE bottom
  menu bar retured to the normal "breeze" light grey colour.

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  Recent libgl-mesa graphics update prevents drop down list menu
  appearing in apps like firefox three line/bar menu icon

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