I've just completed setup of my DOD CAC reader in Kubuntu 12.04 LTS. I'm using the "coolkey" crypto module. When I have the CAC inserted in the reader, and run Firefox, it immediately crashes. As soon as I remove the CAC, Firefox runs fine. Note that I had this working fine in 10.04 LTS.
Turns out that even the latest version of coolkey doesn't work. I had to remove everything related to the CAC reader, reinstall the needed components, replacing coolkey with cackey. Then I could successfully install the device in FireFox!
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