Thunderbird Crash after upgrade to 20.09

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If you use channels, please ensure you have up to date channels for both configuration.nix and nix-env:

  • sudo nix-channel --update and nix-channel --update.

Programs from up to date channels will not try read configuration from /etc/fonts/2.11.

Unfortunately, the old program might have created fontconfig cache that would break other programs in a similar way. I recommend you also delete the cache if it exists:

  • rm -r ~/.cache/fontconfig

Sorry for the inconvenience.

For details about what is causing this, you can read fontconfig: 2.12.6 -> 2.13.92 by worldofpeace · Pull Request #73795 · NixOS/nixpkgs · GitHub and Applications linked against fontconfig 2.12 do not see fonts on nixos-unstable · Issue #94073 · NixOS/nixpkgs · GitHub.

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