nix upgrade-nix failed to update on a profile lock file issue. #1054

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opened 2025-11-29 02:29:16 +00:00 by davidlenfesty · 0 comments

davidlenfesty commented 2025-11-29 02:29:16 +00:00

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Describe the bug

When using the nix upgrade-nix from 1.93 to 1.94 as a user, it failed to apply the change to the profile. It failed on trying to remove the Lix 1.93 package from the profile, specifically it failed to open the profile lock in /nix/var/nix/profile/default, with a permissions error.

I have lost the original logs, I did not save them and I have worked around the issue by running the upgrade as root:

sudo -s
source /nix/var/nix/profile/default/etc/<something>.d/nix.sh
nix upgrade-nix

I have not tried to reproduce this in a VM yet but was asked to make the issue when I brought it up in the Matrix chat. I'll see if I can get around to trying to reproduce.

Steps To Reproduce

1. Install Lix 1.93 on Ubuntu 22.04
2. nix upgrade-nix

Expected behavior

It should have worked!

nix --version output

Lost it after I worked around the issue :(, upgrading from 1.93 -> 1.94 though.

Additional context

Ubuntu 22.04

Lix was installed through the online installer.

There is a chance I installed NixCpp first, then uninstalled it to replace with lix. I don't know if this is true.

## Describe the bug When using the `nix upgrade-nix` from 1.93 to 1.94 as a user, it failed to apply the change to the profile. It failed on trying to remove the Lix 1.93 package from the profile, specifically it failed to open the profile lock in `/nix/var/nix/profile/default`, with a permissions error. I have lost the original logs, I did not save them and I have worked around the issue by running the upgrade as root: ``` sudo -s source /nix/var/nix/profile/default/etc/<something>.d/nix.sh nix upgrade-nix ``` I have not tried to reproduce this in a VM yet but was asked to make the issue when I brought it up in the Matrix chat. I'll see if I can get around to trying to reproduce. ## Steps To Reproduce 1. Install Lix 1.93 on Ubuntu 22.04 2. `nix upgrade-nix` ## Expected behavior It should have worked! ## `nix --version` output Lost it after I worked around the issue :(, upgrading from 1.93 -> 1.94 though. ## Additional context Ubuntu 22.04 Lix was installed through the online installer. There is a chance I installed NixCpp first, then uninstalled it to replace with lix. I don't know if this is true.

davidlenfesty added the

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label 2025-11-29 02:29:16 +00:00

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sb/raito/flakes-out-of-core

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sb/raito/darwin-kqueue-disablement

sb/raito/hydra-merge

sb/raito/phantom-referrers-gc

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sb/pennae/io-rewrite

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sb/bacchanalia/cache-strlen%topic=substr-perf

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sb/rbt/test-branch

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dependabot/github_actions/zeebe-io/backport-action-2.4.1

dependabot/github_actions/cachix/install-nix-action-25

dependabot/github_actions/actions/labeler-5

dependabot/github_actions/cachix/cachix-action-14

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Reference

lix-project/lix#1054

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