I upgraded to 10.04.1 today and got the same problem.
Solution:
In /etc/gre.d
Delete old file 1.9.1.9.system.conf
Rename new file 1.9.2.8.system.conf.dpkg-bak to 1.9.2.8.system.conf
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Gecko-dependent apps won't start ("Could not find compatible GRE")
https://bugs.launchpad.net/bugs/568876
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