Lightning will not install because Thunderbird cannot modify the needed file

Am using OpenSUSE with a shared .default file for Linux and Mint, where it works. Originally the file loaded but the calendat was unresponsive. Removed and tried to reinstall and now get the above message.
What file does it need and how do I get it to be modifiable while using a common .default file?

Check the file ownership, i.e. the user id which owns the file. There is a numeric value behind a user name. My best guess is that the numeric user ids are different for your OpenSUSE and Ubuntu installations.
Start in the extensions directory for Lightning of your Thunderbird profile. This should be something like:
/home/<user id>/.thunderbird/<profile name>/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}

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