I don't know what has happened, but it appears that, after the most recent update, emacs has disappeared. Invoking 'emacs' from terminal:
->bash: emacs: command not found Did 'find /gnu/store -name emacs' and got lots of output, including /gnu/store/j98fjbkjzds51d2xcqqxb83zspicafz1-emacs-29.4/bin/emacs - giving this file to bash: ->/gnu/store/j98fjbkjzds51d2xcqqxb83zspicafz1-emacs-29.4/bin/emacs: symbol lookup error: /gnu/store/l6gska2qy8bj3i7i67ap7ii3cchnfp8j-dconf-0.40.0/lib/gio/modules/libdconfsettings.so: undefined symbol: g_once_init_enter_pointer This error message is above my paygrade, but I'm unfussed at that since I'm not sure this is the correct binary anyway (or if it would act any differently if it is). I'm going to run through the full 4-step upgrade again & see if that fixes it... I need my emacs :(