Hi, after some debugging I found a solution which works fine for me and successfully builds Images and ISOs in Docker again.
Commenting out this line in debootstrap makes it work again: https://sources.debian.org/src/debootstrap/1.0.114/functions/#L1161 So either the issue is in debootstrap or there needs to be a patch in live-build to circumvent the issue of unmounting the dockers /proc Input is welcome as I am unsure on how to procede here (e.g. opening up a bug in debootstrap or leave it here) Greetings -- ZevenOS / Neptune Team https://neptuneos.com Leszek Lesner <les...@zevenos.com>