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From: David Sauvage <sauvage.david@gmail.com>
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Subject: Re: Issues with GPS on Xubuntu
Date: Fri, 10 Sep 2010 12:18:51 -0700 (PDT)
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> I do get a warning on startup about missing libpng12.so - related ?

In the case the libpng12.so library is missing
---------------------------

On Debian & derivatives Linux distributions, you can easily know to
what package a missing file belongs with apt-file.

$ sudo aptitude install apt-file
$ apt-file update
$ apt-file search libpng12.so
libpng12-0: /lib/libpng12.so.0
libpng12-0: /lib/libpng12.so.0.42.0
libpng12-dev: /usr/lib/libpng12.so
lsb-build-desktop3: /usr/lib/lsb3/libpng12.so
$ sudo aptitude install libpng12-dev libpng12-0

The latter command will install the libpng12-dev & libpng12-0 packages
and thus the libpng12.so missing library.
Then relaunch GPS (GNAT GPL) again to sort out if that was the
problem.

That _should_ solve your problem.