Clicking on the "Installing Software" window's "Close" (X) gadget hangs gdebi

[Scott Cowles Jacobs]

When gdebi is installing or removing software, an "Installing Software" window pops up.
When it is finished, instead of clicking on the "Close" button, I keep forgetting and
click on the window's "Close" gadget instead.
The window disappears, but the main window does not recover.
The buttons are greyed out, and the main window's "Close" gadget is non-functional.

I have to keep using htop in a terminal to kill (SIGTERM) gdebi's process.

One expects using the window's "Close" gadget will accomplish the same thing as clicking the
"Close" button, but it does not.

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scott@scott-ASUS-M2N68-AM-PLUS:~$ uname -a
Linux scott-ASUS-M2N68-AM-PLUS 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
scott@scott-ASUS-M2N68-AM-PLUS:~$ lsb_release -dsc
Ubuntu 16.10
yakkety
scott@scott-ASUS-M2N68-AM-PLUS:~$ echo $DESKTOP_SESSION
Lubuntu
scott@scott-ASUS-M2N68-AM-PLUS:~$ gdebi --version
0.9.5.7ubuntu1

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ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: gdebi 0.9.5.7ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0
Uname: Linux 4.8.0-26-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: LXDE
Date: Thu Nov 3 20:34:44 2016
InstallationDate: Installed on 2016-10-20 (15 days ago)
InstallationMedia: Lubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
PackageArchitecture: all
SourcePackage: gdebi
UpgradeStatus: No upgrade log present (probably fresh install)