[Bug 1228906] Re: Lightning not available even though xul-ext-lightning is installed

[Chris Coulson]

This means that the /usr/lib/thunderbird/extensions -> /usr/lib
/thunderbird-addons/extensions symlink is broken on your install because
there are unsupported packages installing files in to
/usr/lib/thunderbird/extensions. It's likely this has always been broken
on your install. The difference here is that lightning moved to /usr/lib
/thunderbird-addons/extensions with this update as a consequence of us
merging the Thunderbird and Lightning sources

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https://bugs.launchpad.net/bugs/1228906

Title:
  Lightning not available even though xul-ext-lightning is installed

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