The issue with them properly colliding is ticketed. But if Austin was only doing an upgrade, it should not be switching. We cannot have dependencies on both the single precision and double precision versions. We need to find out why the single precision version is being installed on an upgrade and avoid that. 

Tully



On Thu, Dec 24, 2015 at 7:30 AM, G.A. vd. Hoorn - 3ME via ros-release <ros-release@lists.ros.org> wrote:
On 24/12/15 16:26, Austin Hendrix via ros-release wrote:
It looks like the new collada packages that were pulled in recently are
causing upgrade problems.

I did an apt-get dist-upgrade on my system today, and it looks like
there's a collision between collada-dom2.4-sp-dev and
collada-dom2.4-dp-dev, and apt wants to install both at the same time:

$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
   collada-dom2.4-sp-dev
The following NEW packages will be installed:
   collada-dom2.4-sp-dev
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
47 not fully installed or removed.
Need to get 0 B/206 kB of archives.
After this operation, 5,285 kB of additional disk space will be used.
Do you want to continue? [Y/n]
(Reading database ... 333408 files and directories currently installed.)
Preparing to unpack
.../collada-dom2.4-sp-dev_2.4.4.1-ubuntu1~trusty1_amd64.deb ...
Unpacking collada-dom2.4-sp-dev (2.4.4.1-ubuntu1~trusty1) ...
dpkg: error processing archive
/var/cache/apt/archives/collada-dom2.4-sp-dev_2.4.4.1-ubuntu1~trusty1_amd64.deb
(--unpack):
  trying to overwrite
'/usr/lib/cmake/collada_dom-2.4/collada_dom-config.cmake', which is also
in package collada-dom2.4-dp-dev 2.4.4.0-ubuntu1~trusty1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
  /var/cache/apt/archives/collada-dom2.4-sp-dev_2.4.4.1-ubuntu1~trusty1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)


Thoughts? Known workarounds?

This is a 'known' issue, see [1] and the linked issues in the answer. The packages have been fixed and are waiting for the next sync.


Is there a known reason why apt would want to install the sp and dp
versions at the same time? Up until now I think I've only had the dp
version installed.

If the sp and dp versions aren't supposed to be installed at the same
time, can the maintainer please add a Conflicts: to the package header?


 Gijs

[1] http://answers.ros.org/question/222892/collada-dom24-sp-dev-causes-dist-upgrade-to-fail-on-ubuntu-1404/


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