** Changed in: sane-backends (Ubuntu)
Assignee: Franz Engel (frangelo) => (unassigned)
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https://bugs.launchpad.net/bugs/1707352
Title:
the change from libsane to libsane1 broke many (all?) 3rd party plug-
ins for sane
Status in sane-backends package in Ubuntu:
Fix Released
Status in sane-backends source package in Artful:
Fix Released
Status in sane-backends package in Debian:
New
Bug description:
Note to SRU Team
================
The first proposed fix (1.0.27-1~experimental2ubuntu2) failed because it
needed to be a versioned Provides, not just a Provides.
Impact
======
1) The Debian maintainer renamed libsane to libsane1-experimental "to
match with the soname". This apparently fixes a Lintian warning, but
makes installing 3rd-party plug-ins hard, as they typically depend on
"libsane", not on "libsane1". The first try to add a "Provides:
libsane" to libsane1 (which created a virtual package) didn't make
drivers installable that claim to depend on a minimum version of
libsane as virtual packages are ignored in this case.
2) The soname change might be justified by the new version breaking
(several? most?) 3rd party plug-ins even if the library version number
doesn't indicate any bigger change than any ordinary new version of
the library - which might indicate that this phenomenon might be an
upstream bug.
libsane 1.0.25 in zesty includes libsane.so.1.25
libsane1 1.0.27 in artful includes libsane.so.1.27
It is to note that depending on the manufacturer for many old scanners
there won't be new versions of the plug-ins that are recompiled like
this.
Test Case
=========
Visit http://support.epson.net/linux/en/iscan_c.html
Download the amd64 deb .tar.gz
Unzip it.
Install the iscan .deb from the core folder.
It won't install before this SRU because it Depends: libsane
Regression Potential
====================
The fix here was proposed to the Debian maintainer in July but there's been
virtually zero response on it. In the meantime the workaround that was proposed
initially has started to result in automatically uninstalling gtk - which makes
the system basically useless.
It doesn't seem like adding the Provides will make things any worse
for third-party drivers but it has a goodme chance of making things
better for some.
Original Bug Report
===================
I don't know if that can be prevented in the long run. But both brscan (for
my brother scanner) and iscan (for my epson scanners) have been broken by the
change from libsane to libsane1. For iscan I have unpackaged the debian
package, changed the dependency it contains from libsane to libsane1 and
installed the changed package. But even then my epson scanners no more work
leaving me without any scanner => Reporting a bug.
Impossibility of workarounds
----------------------------
Just installing an old version of libsane is impossible as it uninstalls
libgtk (which depends on libsane1 which conflicts with libsane) making the
system basically useless.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: libsane1 1.0.27-1~experimental1ubuntu2
Uname: Linux 4.13.0-041300rc2-lowlatency x86_64
ApportVersion: 2.20.6-0ubuntu4
Architecture: amd64
Date: Sat Jul 29 08:38:15 2017
EcryptfsInUse: Yes
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)
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