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Could somebody please tell me how to roll Thunderbird back to 11.x, or get a working version of Lightning (which claims it is incompatible with 12.0). I'm currently not able to view my calendar :(

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3 Answers 3

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You neednot downgrade thunderbird to get working version of Lightning. Install this addon

https://addons.mozilla.org/en-US/thunderbird/addon/lightning-nightly-updater-unof/?src=search

It will search for compatible version of Lightning and install it

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  • There is no 64 bit support here so this will not work for most users.
    – micahg
    Mar 29, 2012 at 21:06
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If you want to stick with the in distro packages, you can use ppa-purge to remove the thunderbird-next PPA until compatible versions of lightning are available there. This should roll you back to the distro version 11.

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You might see if the Nightly Tester Tools addon can still disable addon compatibility checking. (The Add-on Compatibility Reporter addon, which I would have otherwise recommended instead, no longer disables compatibility checks.)

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