Hey, in my case the steps to fix it were as follows:
1. Download thunderbird tar.bz2 from https://www.thunderbird.net/
2. Extract it wherever you want
3. In extracted thunderbird folder you will find lightning xpi file compatible with TB 60.2.1: distribution/extensions/{e2fda1a4-762b-4020-b5ad-a41df1933103}.xpi
4. Open your Thunderbird 60.2.1 installed from Ubuntu repo
5. Go to Addons -> Install addon from file and choose xpi file from point 3
6. Restart Thunderbird and enjoy Lightning once again :)
Hey, in my case the steps to fix it were as follows: /www.thunderbir d.net/ extensions/ {e2fda1a4- 762b-4020- b5ad-a41df19331 03}.xpi
1. Download thunderbird tar.bz2 from https:/
2. Extract it wherever you want
3. In extracted thunderbird folder you will find lightning xpi file compatible with TB 60.2.1: distribution/
4. Open your Thunderbird 60.2.1 installed from Ubuntu repo
5. Go to Addons -> Install addon from file and choose xpi file from point 3
6. Restart Thunderbird and enjoy Lightning once again :)
Hope this helps.