Comment # 25 on bug 875406 from Fabian Vogt

(In reply to Fabian Vogt from comment #24)
> *** Bug 1048145 has been marked as a duplicate of this bug. ***

So this still happens with Leap 42.3, but the cause seems slightly different.
It tries to load the slideshow from the repository, but fails due to this (full
y2log attached):

2017-07-12 16:57:57 <1> lagarto(11401) [Ruby] modules/Packages.rb:1290 Checking
'/suse/setup/slide//txt/de_DE'
2017-07-12 16:57:57 <1> lagarto(11401) [Pkg] modules/Packages.rb:1291 Pkg
Builtin called: SourceProvideSignedDirectory
2017-07-12 16:57:57 <1> lagarto(11401) [zypp:fetcher]
Fetcher.cc(downloadAndReadIndexList):723 No indexes to read.
2017-07-12 16:57:57 <1> lagarto(11401) [zypp:fetcher]
Fetcher.cc(addDirJobs):480 Adding directory /suse/setup/slide/txt/de_DE
[...]
2017-07-12 16:57:57 <1> lagarto(11401) [zypp++]
MediaCurl.cc(doGetFileCopyFile):1494 URL:
http://dist.suse.de/netboot/find/openSUSE-Leap-42.3-x86_64-DVD1/suse/setup/slide/txt/de_DE/directory.yast
2017-07-12 16:57:57 <3> lagarto(11401) [zypp]
MediaCurl.cc(doGetFileCopyFile):1558 curl error: 22: The requested URL returned
error: 404 Not Found, temp file size 0 bytes.
[...]
2017-07-12 16:57:57 <2> lagarto(11401) [zypp:fetcher]
Fetcher.cc(addDirJobs):488 Skiping subtree hidden at
/suse/setup/slide/txt/de_DE
2017-07-12 16:57:57 <1> lagarto(11401) [Ruby] modules/Packages.rb:1299 de_DE
lang found

In short, libzypp returns that /suse/setup/slide/txt/de_DE/ exists, which is
not the case.

AFAICT, this is a regression in libzypp, starting by this commit:
https://github.com/openSUSE/libzypp/commit/fda8b348618f47f9da3743bbde02ce9c64d39417#diff-df6a28615dc8b6e06809a2440f5ba3b8R482

So reassigning to libzypp.