[Bug 476520] Re: [Karmic] Lost Lightning calendars when upgrading from 9.04 to 9.10

[Husain Al-Khamis]

@simon I confirm you solution.
Before upgrading from 9.04 to 9.10 i was using downloaded Thunderbird from Mozilla website, i.e was not installed from Ubuntu repositories. After upgrading to 9.10 i found that Thunderbird wasn't working at all. I just removed it and reinstalled it from Ubuntu repository "apt-get". I made a backup of my last Thunderbird profile and replaced it with the new profile "~/.mozilla-thunderbird/". Now here was the problem, the backed up profile already contained the previously installed extensions which were downloaded from Mozilla website.
So as @simon said 
"You have to uninstall Lightning from within Thunderbird Addons then install from the repositories (using Synaptic if you want)."

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[Karmic] Lost Lightning calendars when upgrading from 9.04 to 9.10
https://bugs.launchpad.net/bugs/476520
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