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+title = "Lix installations upgrading to macOS Sequoia require manual repair"
+author = "Lix Team"
+date = "2024-09-15"
++++
+
+macOS Sequoia release day is almost upon us, and that means all your Lix and Nix installations on macOS are going to break when you upgrade your OS.
+Apple claimed some user IDs that are used in the default Nix installation which are then clobbered by the updater, leading to builds failing with the following error:
+
+```
+error: the user '_nixbld1' in the group 'nixbld' does not exist
+```
+
+To fix this, you can use the repair functionality of the installer (thanks to cole-h at DetSys for implementing the repair functionality and emilazy for porting it to lix-installer!):
+
+```
+curl -sSf -L https://install.lix.systems/lix | sh -s -- repair sequoia
+```
+
+If you want to apply the repair before upgrading, add `--move-existing-users` to the end of the command.
+
+We have a wiki page with more links and details here: https://wiki.lix.systems/link/81