[Bug 1618956] Re: Slideshow blank during live install

[Mathew Hodson]

** No longer affects: ubiquity (Ubuntu)

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Jeremy Bicha]

** Changed in: webkit2gtk (Ubuntu)
   Status: Fix Committed => Fix Released

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Jeremy Bicha]

This bug was fixed in the package webkit2gtk - 2.12.5-1

---
webkit2gtk (2.12.5-1) unstable; urgency=medium

  * New upstream release.
  * debian/patches/fix-ftbfs-m68k.patch:
+ Drop this patch, the m68k build has been broken for ages.
  * debian/patches/fix-ftbfs-sparc64.patch:
+ Refresh.

 -- Alberto Garcia   Mon, 05 Sep 2016 13:49:55 +0300

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Jeremy Bicha]

I tested with webkit2gtk 2.12.5-1 rebuilt in my PPA and the slideshow
works so I'll be syncing webkit2gtk once LP picks it up.

** Changed in: webkit2gtk (Ubuntu)
   Status: Triaged => Fix Committed

** Changed in: ubiquity (Ubuntu)
   Status: Confirmed => Invalid

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[Bug 1618956] Re: Slideshow blank during live install

[Iain Lane]

F everyone's I: It's unrelated to the compiler - I built 2.12.3 with GCC
6 and it works still, and I built 2.12.4 with GCC 5 and it breaks still.

Here's hoping that 2.12.5 is better. I've stolen it from
incoming.debian.org and tossed it at ppa:laney/ppa.

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  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Michael Catanzaro]

To be clear: I do not think our bugfix updates (2.10.9 -> 2.10.10) are
really much safer than the bigger updates (2.10 -> 2.12) in terms of
likelihood of regressions. Actually I think we've had worse luck with
regressions in stable releases; we tend to backport bad patches long
before they show up in the next stable release. Our stable series get
six months of security support and you're expected to move onto the next
stable series shortly after it's released. Support for 2.10 ended
*before* you released Xenial with 2.10.9. We've announced 16
vulnerabilities affecting 2.10.9 since then
. It'd be great to get those fixes
out to Ubuntu users.

Regarding the need to rebuild GNOME components. Fortunately, all of our
documented API is guaranteed to be API/ABI stable indefinitely, but
there is an undocumented unstable API as well. I know this is a problem.
For 2.12 -> 2.14, I suggested rebuilding all apps using the unstable API
(Epiphany/Evolution/Yelp) just to be safe, but actually Epiphany is the
only required rebuild that I'm aware of. I've had a hard time convincing
the relevant developer that the unstable API is a problem for distros,
but the problem is fortunately going away, because we froze the DOM API
last week, and we'll be removing or stabilizing all the unstable API for
2.16. So after next cycle, you won't have to be concerned about third
party apps using the unstable API anymore, as it will all be gone.

In the meantime, if you're concerned about third party apps breaking:
I'm not aware of any third party app developers using WebKit2 at all,
let alone any using the unstable portion of the DOM API (which is not
available at all unless you define a macro to guarantee the developer
knows it can break), let alone a portion of that API that has changed
recently. If any such third-party developers exist, I would hope they
would be smart enough to bundle WebKit, rather than rely on a system API
that's clearly marked unstable, which they know can change at any time.
So I think it's fairly low-risk; you just need to keep an eye on known
users of the API until it goes away.

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Sebastien Bacher]

@Michael, thanks for the comment, indeed it's tricky to update stable
distros to newer series if those create regressions or have changes that
impact applications (like needing to rebuild GNOME components is an
indication that third party apps customers rely on could stop working),
we usually do bugfix updates in a serie though but there is only 2.10.10
out in the 2.10 serie and it's from august so seen from this angle we
didn't miss on much updates...

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Michael Catanzaro]

I very much want to see 2.12 for Xenial. Still, I'll be honest: we still
have a couple serious regressions each cycle, and any WebKit release
could break anything. E.g. we had to release 2.12.5 today to fix a nasty
network process hang when there is a load failure, which was introduced
in 2.12.4. It's possible that could be causing the issue here (though
that would probably indicate some other bug in ubiquity). Try with
2.12.5 and see if it works better. (If not, since the issue is already
fixed, I would simply wait a couple weeks for 2.14.0 and skip 2.12
entirely.)

When there is a major regression like this in a stable release, Arch
users and Fedora testers normally notice very soon, and we normally have
a corrected release out within a week or two. If you hold WebKit updates
in testing for two weeks as part of the SRU process, or, say, a month to
be very conservative, then Ubuntu would have an excellent chance to
avoid most such regressions while still being able to ship WebKit
security updates in a timely manner. (It's very disappointing to see
WebKit has not had a single update since Xenial was released.)

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Jeremy Bicha]

Incidentally, the slideshow works with webkit2gtk 2.13.90. While that
could work for yakkety, we still need to get 2.12 working since mdeslaur
was interested in uploading 2.12.4 to xenial later this month. I would
say that webkit releases are more stable these days but this bug kinda
argues against that, right?

I think we need to get a simpler test case to make a more effective bug
report upstream.

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Title:
  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Sebastien Bacher]

** Tags added: rls-y-incoming

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  Slideshow blank during live install

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[Bug 1618956] Re: Slideshow blank during live install

[Iain Lane]

Ya, this broke with the update to 2.12.4, and works if you downgrade to
2.12.3

You can apply this

=== modified file 'ubiquity/frontend/gtk_ui.py'
--- ubiquity/frontend/gtk_ui.py 2016-06-30 14:33:11 +
+++ ubiquity/frontend/gtk_ui.py 2016-09-02 08:39:34 +
@@ -759,6 +759,9 @@
 self.set_current_page(0)
 self.live_installer.show()
 
+self.start_slideshow()
+Gtk.main()
+
 while(self.pagesindex < len(self.pages)):
 if self.current_page is None:
 return self.returncode
@@ -814,8 +817,6 @@
 
 # There's still work to do (postinstall).  Let's keep the user
 # entertained.
-self.start_slideshow()
-Gtk.main()
 self.pending_quits = max(0, self.pending_quits - 1)
 # postinstall will exit here by calling Gtk.main_quit in
 # find_next_step.

to test just the slideshow step.

** Changed in: webkit2gtk (Ubuntu)
 Assignee: (unassigned) => Jeremy Bicha (jbicha)

** Changed in: webkit2gtk (Ubuntu)
   Status: New => Triaged

** Changed in: webkit2gtk (Ubuntu)
   Importance: Undecided => High

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[Bug 1618956] Re: Slideshow blank during live install

[Iain Lane]

** Also affects: webkit2gtk (Ubuntu)
   Importance: Undecided
   Status: New

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[Bug 1618956] Re: Slideshow blank during live install

[Sebastien Bacher]

** Changed in: ubiquity (Ubuntu)
   Importance: Undecided => High

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[Bug 1618956] Re: Slideshow blank during live install

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubiquity (Ubuntu)
   Status: New => Confirmed

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[Bug 1618956] Re: Slideshow blank during live install

[Ubuntu QA Website]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1618956

** Tags added: iso-testing

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