Comment 19 for bug 1671540

On 17.04 I have a very similar problem. The Software Updater icon in the Unity launch bar has turned green to indicate that updates are available. When I click on that icon it gains an orange "halo" indicating that the system knows that it has been selected, but no window opens. I cannot manually start the Software Updater. I have to reboot in order to run the Software Updater. xwininfo knows the window is there but nobody else does. I have had this problem for over a month and I would really appreciate some guidance.

$ xwininfo -name "Software Updater"

xwininfo: Window id: 0x3200008 "Software Updater"

  Absolute upper-left X: 769
  Absolute upper-left Y: 384
  Relative upper-left X: 769
  Relative upper-left Y: 384
  Width: 447
  Height: 335
  Depth: 24
  Visual: 0x300
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x3200007 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsUnMapped
  Override Redirect State: no
  Corners: +769+384 -704+384 -704-361 +769-361
  -geometry 447x335+769+384