I reinstalled Ubuntu 11.10 the other day and now when I try to install the Lightning extension in Thunderbird it states: Lightning is not compatible with Thunderbird 7.0.1.
As extra information lightning is not comming up automaticly when searching for it within Thunderbird. You need to download it manually.
And also I had it installed before I reformated the computer.
Anybody has a solution to this issue?
I'd suggest making sure you're using the version in the Ubuntu archive instead of the version from addons.mozilla.org. The package is called xul-ext-lightning (Click to install). We keep lightning updated with Thunderbird.
There will be an upgrade to 8 early next week that should come with a new compatible lightning as well. Also, the version in the Ubuntu archive is architecture specific as opposed to addons.mozilla.org which is i386 (32 bit) only.
I also had this problems short after a new Thunderbird version came out. The solution is, to wait with installing the newest version of thunderbird only, when all the extensions are also available in a compatible version.
The latest Lightning 1.0 only works with Thunderbird 8.0. For Thunderbird 7, download Lightning 1.0b7 from here: https://addons.mozilla.org/en-US/thunderbird/addon/lightning/versions/
That is the only version that works with Thunderbird 7 so make sure you don't download some other version. Once downloaded, in Thunderbird open "Addons", click the icon on the left of "Search all add-ons" and select "Install Add-on from file", browse for the downloaded Lightning 1.0b7 .xpi and you're done.
Looks like the package as of today has no "-extension" in its name. This worked for me:
sudo apt-get install xul-ext-lightning