I have the same error after upgrading to Ubuntu 12.04.
I've tried to delete ~/.gstreamer-0.10, but this don't solved the problem
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I can confirm this fix solves the same problem on a 64-bit system
recently upgraded from Oneiric to Precise.
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https://bugs.launchpad.net/bugs/770158
Title:
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Desktop Bugs, which is subscribed to gstreamer0.10 in Ubuntu.
https://bugs.launchpad.net/bugs/770158
Title:
Totem fails to play any media after upgrading to Ubuntu 11.04 Beta
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I can now say for certain that this is a configuration issue, and not a
corrupt or missing package. After creating a new dummy user on the
system, I can play music and videos just fine, however, it's still
broken in my user account.
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Update: For anybody else who experiences this issue after updating to
11.04, the fix is to delete the folder ~/.gstreamer-0.10. After doing
that, the issue should be fixed immediately without a need to logout or
reboot your system. It would appear that the problem was a corrupt
gstreamer
