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I am not able to thunderbird application. whenever i try to it says "Thunderbird is already running, but is not responding. To open a new window you should close the existing thunderbird process, or restart your system.
I have restarted the system, but still the same issue.
Often, when this happens after application crashed and did not remove the lock files. Check your ~/.thunderbird/<profile name>/ or maybe ~/.mozilla-thunderbird/<profile name>. Look for lock and/or .parentlock and delete them. Once they deleted, you should be able to start Thunderbird.
Note, this behavior can also apply to Mozilla suite of apps to include Firefox.