Public bug reported:

I just tried to do another long (14 picture) panorama (also with a
tripod).
This one had a wide brightness range, which was eventually going to cause a 
problem, but I told it to go ahead and align it anyway.
In two different runs-through, I got two slightly different results:
1: Alignment finished, but I could see a problem between what appeared to be 
photos 8 and 9.
I tried to call up the window where I could manually enter control points.
Window comes up - blank.  Nothing more.  Had to kill the process.
2: The second time around, I noticed that it could find no control points 
between Photo 8 and 9.
Not surprising, but when it finished, it put up a window, and then an error box 
but both were blank, and nothing further was possible, except killing the 
process.

A third time, I started Hugin from the terminal.
some gtk-critical warnings and some info came up immediately, but until I 
reached the blank-window=and-error-box stage, nothing more.
Then, I got:
"(hugin:4321): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate 
widget with width 0 and height -27

(hugin:4321): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to
allocate widget with width -5 and height 17

"
The gtk critical warnings i then noted were also widget-based, so I will 
mention that there were 12 identical lines:
"(hugin:4321): Gtk-CRITICAL **: IA__gtk_widget_set_size_request: assertion 
'height >= -1' failed
"
I will attach a text file with the complete terminal output.

This appears to be a freeze/endless loop, as when I brought up HTOP, one
or other of my CPU cores was (almost) always at a full 100%

---------------------------------------------------
scott@scott-Asus-M2N68-AM-PLUS:~$ uname -a
Linux scott-Asus-M2N68-AM-PLUS 4.13.0-46-generic #51-Ubuntu SMP Tue Jun 12 
12:36:29 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
scott@scott-Asus-M2N68-AM-PLUS:~$ lsb_release -dsc
Ubuntu 17.10
artful
scott@scott-Asus-M2N68-AM-PLUS:~$ echo $DESKTOP_SESSION
QLubuntu

scott@scott-Asus-M2N68-AM-PLUS:~$ apt-cache policy hugin*
hugin:
  Installed: 2018.1.0+hg7969+dfsg-0ubuntu1~artful
  Candidate: 2018.1.0+hg7969+dfsg-0ubuntu1~artful
  Version table:
 *** 2018.1.0+hg7969+dfsg-0ubuntu1~artful 500
        500 http://ppa.launchpad.net/hugin/nightly/ubuntu artful/main amd64 
Packages
        100 /var/lib/dpkg/status
     2017.0.0~rc2+dfsg-2 500
        500 http://us.archive.ubuntu.com/ubuntu artful/universe amd64 Packages

(I was using 2017.0.0~rc2+dfsg-2 (Standard for [L]ubuntu 17.10) originally, but 
noted that
elsewhere, a more recent version was available, and thought that perhaps the 
"bug" (?) had been fixed there. Alas, no...
Hugin itself prints "2018.1.0.aac6fbdf0772" for my current version, from the 
"Help" menu.)

(I don't print the pkgs for enblend/enfuse here, as it never gets that
far...)

------------------------------------------------------------------

** Affects: hugin (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Hugin terminal output"
   
https://bugs.launchpad.net/bugs/1815996/+attachment/5238805/+files/Hugin_Freeze_Bug.txt

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https://bugs.launchpad.net/bugs/1815996

Title:
  Hugin freezes after alignment

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