Description of problem: The ubuntu-18.04 template from the preconfigured repo at libguestfs.org has configured apt to use a caching proxy that is not available to most users of virt-builder. /etc/apt/apt.conf: Acquire::http::Proxy "http://cache.home.annexia.org:3128"; Without manually clearing that file, all commands that rely on apt being able to reach remote repositories (install, update, etc.), will fail. Steps to Reproduce: 1. run 'virt-builder --install libguestfs0 ubuntu-18.04' (or similar) Actual results: Could not resolve 'cache.home.annexia.org' Expected results: Image is built successfully, and includes the nice library the user wanted to install. Respinning the template seems appropriate.
Ooops, that's my proxy :-( I'll fix this in the next build, hopefully tomorrow. In the meantime you can delete the offending file or line using --delete or --edit.
This is fixed in revision 2 of the image which has just been uploaded.