libmuse_core.so: cannot open shared object file

[Jaufré Aligé]

[Impact]

Since Ubuntu 15.10, muse does not start and gives the following error:

$ muse
muse: error while loading shared libraries: libmuse_core.so: cannot open shared object file: No such file or directory

The fix for this should be backported to Xenial since muse is currently useless "as is".

[Technical Details]

Force muse modules to be installed under /usr/lib/muse

Ubuntu CMake contains the script 'MultiArchCross.cmake' which is invoked for all Make packages and sets CMAKE_INSTALL_LIBDIR to include the multiarch path
without the install prefix (ie something like "lib/x86_64-linux-gnu"). This
variable is not defined when building on Debian.

Muse constructs a LIB_INSTALL_DIR variable (when it's not defined) using
CMAKE_INSTALL_LIBDIR or an alternate fallback. Unfortunately later on in the
script when handling the RPATH settings, Muse assumes that LIB_INSTALL_DIR is an absolute path. This is true on Debian, but not on Ubuntu. This causes a bogus RPATH to be inserted into the main Muse executable which prevents Muse from finding any of it's modules and immediately crashes on startup.

The simple fix is to force LIB_INSTALL_DIR=/usr/lib. Although an Ubuntu specific problem, it does no harm to do this on Debian as well.

[Test Case]

From within a terminal window, run "muse". The following error is printed:
muse: error while loading shared libraries: libmuse_core.so: cannot open shared object file: No such file or directory

When working normally, the muse arranger window should appear. If an error
appears about Jack not running, you can ignore it.

[Regression Potential]

Muse is a totally independent application with no reverse dependencies in the archive. Therefore it is unlikely there will be any regressions in other packages.

Since Muse is completely non-functional in Xenial, it's difficult for it to regress any further. :)

[Other Info]

A workaround for this bug is to set the linker path manually when running muse. For example:

LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/muse/modules muse

[Andrew Pyne (andrew.py)]

libmuse_core.so is here: /usr/lib/x86_64-linux-gnu/muse/modules/libmuse_core.so

You can start muse with the following workaround:

export LD_LIBRARY_PATH=:/usr/lib/x86_64-linux-gnu/muse/modules:$LD_LIBRARY_PATH
muse

[James Cowgill (jcowgill)]

Although this bug is Ubuntu specific, it is fixed in Debian 2.1.2-3 which should make its way into Ubuntu at some point.

[James Cowgill (jcowgill)]

Sponsors,

Fixing this needs two uploads:
 One to sync muse_2.1.2-3 from Debian sid to Ubuntu yakkety.
 The above patch to fix this bug in Xenial.

[Launchpad Janitor (janitor)]

This bug was fixed in the package muse - 2.1.2-3

---------------
muse (2.1.2-3) unstable; urgency=medium

  * Team upload.
  * Force muse modules to be installed under /usr/lib/muse. (LP: #1596486)

 -- James Cowgill <email address hidden> Fri, 02 Sep 2016 12:08:59 +0000

[Marc Deslauriers (mdeslaur)]

ACK on the debdiff in comment #4. I've applied it with slight version changes to xenial and yakkety so that the upgrade path is preserved. Uploaded for processing by the SRU team.

Thanks!

[Brian Murray (brian-murray)]

Hello Jaufré, or anyone else affected,

Accepted muse into yakkety-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/muse/2.1.2-2ubuntu0.16.10.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Brian Murray (brian-murray)]

Hello Jaufré, or anyone else affected,

Accepted muse into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/muse/2.1.2-1ubuntu0.16.04.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed 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 add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and 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 https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[James Cowgill (jcowgill)]

Hi,

I've tested muse on xenial and yakkety (2.1.2-1ubuntu0.16.04.1 and 2.1.2-2ubuntu0.16.10.1 respectively). It now starts and I the basic functionality of the program works now. It was done inside two QEMU images.

Thanks for uploading!
James

[Launchpad Janitor (janitor)]

This bug was fixed in the package muse - 2.1.2-1ubuntu0.16.04.1

---------------
muse (2.1.2-1ubuntu0.16.04.1) xenial; urgency=medium

  * Force muse modules to be installed under /usr/lib/muse. (LP: #1596486)

 -- James Cowgill <email address hidden> Fri, 02 Sep 2016 13:53:36 +0100

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for muse 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 regressions.

[Launchpad Janitor (janitor)]

This bug was fixed in the package muse - 2.1.2-2ubuntu0.16.10.1

---------------
muse (2.1.2-2ubuntu0.16.10.1) yakkety; urgency=medium

  * Force muse modules to be installed under /usr/lib/muse. (LP: #1596486)

 -- James Cowgill <email address hidden> Fri, 02 Sep 2016 13:53:36 +0100