There is an issue in Core 3.4.3 (extract-image command) that leads to add-module failures. Involved scenarios: new cluster, join cluster, migration, restore… If two add-modules run concurrently one of them fails for a lock file issue. Reference fix: extract-image regression by DavidePrincipi · Pull Request #791 · NethServer/ns8-core · GitHub.
Possible workarounds:
- for new cluster / join cluster errors with Core 3.4.3: reinstall NS8
- for other cases, where installation/join ran with core <3.4.3, update to Core 3.4.4, then retry. For example, with migration, abort the failing module and start again.