amd64 and i386 version uses same /etc/alternative and conflicts

Bug #1012266 reported by Ernst Sjöstrand on 2012-06-12
This bug affects 1 person
Affects Status Importance Assigned to Milestone
s2tc (Ubuntu)

Bug Description


* 0~git20110809-2 is not multiarch compatible. This means that currently a mix of amd64 and i386 variants can not be installed simultaneously. This is however required for e.g. wine installations which require a i386 version of mesa and therefore s2tc to be installed.
* The recently released Humble Bundle 5 makes use of the s2tc extension but requires both architecture versions to be installed for different games. See Bug #1012266
* The s2tc postinst/prerm scripts use update-alternatives to allow multiple versions of texture compression extensions to be installed and easy switching between these. The update-alternatives key was not multiarch compatible in -2 which was fixed in -3.
* Currently the following bug reports are related to this sync Bug #1012266 and Bug #1023184


 1. Install libtxc-dxtn-s2tc0 and libtxc-dxtn-s2tc0:i386
 2. Notice that the link /usr/x86_64-linux-gnu/ was removed in favor of /usr/lib/i386-linux-gnu/

[Regression Potential]
* There is really none. On update the the old handle is removed and replaced by new multiarch update-alternatives.

* Original Description *

I installed the games from Humble Indie Bundle 5 and got some problems.
First Bastion worked fine. Then I installed Psyconauts and Bastion stopped working.
Bastion depends on libtxc-dxtn-s2tc0:amd64 and Psyconatus depends on libtxc-dxtn-s2tc0:i386.
Both libtxc-dxtn-s2tc0 packages use the same /etc/alternatives/libtxc-dxtn so they randomly overwrite each other.

Lennart Weller (lhw) wrote :

I uploaded a "fix" to debian. As soon as it is build I will request a port to ubuntu if that is required.
This is a really interesting problem though. I build this package with the intent to allow a possible future s3tc package to use the same update-alternatives config. But update-alternatives is currently not adequately set up for libraries especially not for multiarch libraries. This is more or less just a workaround but it should work.

Changed in s2tc (Ubuntu):
status: New → In Progress
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package s2tc - 0~git20110809-3

s2tc (0~git20110809-3) unstable; urgency=low

  * fixes multiarch alternatives bug (LP: #1012266)

 -- Lennart Weller <email address hidden> Tue, 12 Jun 2012 22:36:28 +0200

Changed in s2tc (Ubuntu):
status: In Progress → Fix Released
Ernst Sjöstrand (ernstp) wrote :

Nice! Now Ubuntu is the ultimate gaming platform, no one can stop it!

Scott Kitterman (kitterman) wrote :

Seems SRU worthy.

Changed in s2tc (Ubuntu Precise):
importance: Undecided → High
milestone: none → precise-updates
Lennart Weller (lhw) wrote :

I attached a debdiff targeting precise-proposed created according to Scott.

Brian Murray (brian-murray) wrote :

SRU information regarding this bug can be found in bug 1023197.

Changed in s2tc (Ubuntu Precise):
status: New → In Progress
Brian Murray (brian-murray) wrote :

Thanks for the debdiff I've uploaded it to precise-proposed.

description: updated
description: updated

Hello Ernst, or anyone else affected,

Accepted s2tc into precise-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please change the bug tag from verification-needed to verification-done. If it does not, change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at . Thank you in advance!

Changed in s2tc (Ubuntu Precise):
status: In Progress → Fix Committed
tags: added: verification-needed
Stéphane Graber (stgraber) wrote :

Confirmed that alternatives are now per-architecture.

tags: added: verification-done
removed: verification-needed
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package s2tc - 0~git20110809-2.1

s2tc (0~git20110809-2.1) precise-proposed; urgency=low

  * fixes multiarch alternatives bug (LP: #1012266, LP: #1023184, LP: #1023197)
 -- Lennart Weller <email address hidden> Wed, 18 Jul 2012 13:37:56 -0700

Changed in s2tc (Ubuntu Precise):
status: Fix Committed → Fix Released

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.

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