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Oliver Davies 2025-10-02 00:53:28 +01:00
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---
title: "Error: unsupported tarball input attribute 'lastModified'"
date: 2024-09-10 22:35:41
tags: [Linux, Nix, NixOS]
links:
- https://discourse.nixos.org/t/error-unsupported-tarball-input-attribute-lastmodified/49435/4
---
Yesterday, my laptop died and I needed to resurrect a spare laptop to work on.
This laptop was running an outdated version of NixOS, old packages, a different window manager and other things, so I tried to update it to bring it up to date so it's up to date with my dead laptop's configuration.
Doing so, though, gave me this error:
> Error: unsupported tarball input attribute ‘lastModified’
A normal `sudo nixos-rebuild switch` worked, but trying to use a Flake was generating the error.
I was able to get it working after running these commands from a Discourse thread:
```shell
nix shell "github:NixOS/nix/2.18.4"
nix build .#nixosConfigurations.nixedo.config.system.build.toplevel
sudo nix-env --profile /nix/var/nix/profiles/system --set ./result
./result/bin/switch-to-configuration switch
```
I also needed to add `--experimental-features 'nix-command flakes'` to the `nix` commands to get them to run.
Once this finished, I was able to reboot and get a running up-to-date configuration.