nixos-rebuild fails to build due to missing nixos channel

user_6583529 0
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I wanted to try chaging channels. I did.

nix-channel --add .../nixos-unstable
nix-channel --remove  .../nixos-20.09
nix-channel --update

It worked, it created a link and I could run:

nixos-rebuild switch

However, my i3 stopped working correctly so I wanted to turn back to 20.09:

nix-channel --add .../nixos-20.09
nix-channel --remove  .../nixos-unstable
nix-channel --update

But now it does not recreate that link and when run

nixos-rebuild switch

it fails with

warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels/nixos' does not exist, ignoring
error: file 'nixpkgs/nixos' was not found in the Nix search path (add it using $NIX_PATH or -I), at (string):1:13
building Nix...

I have searched and tried a few solutions that worked for others like rebooting, running t with sudo -i but nothing worked so far. How do I recreate that link ?

nixos nix
1 Answers

Ok I found a way: I added the channel with a different name, instead of default nixos-10.09 just nixos

nix-channel --add ..../nixos-20.09 nixos
nix-channel --remove nixos-20.09 
nix-channnel --update

and lo and behold the link was created and all works again!

user_65835290
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