I also had the problem that Lightning, even if it installed succesfully (from https://addons.mozilla.org/ro/thunderbird/), won't allow me to import any calendar (.ics file): the Import Calendar button was grayed out. The solution we empirically found was:
I also had the problem that Lightning, even if it installed succesfully (from https:/ /addons. mozilla. org/ro/ thunderbird/), won't allow me to import any calendar (.ics file): the Import Calendar button was grayed out. The solution we empirically found was:
- uninstall Lightning
- sudo apt-get install libstdc++5
- reinstall Lightning
Regards,
Răzvan