your container config contains:
note the "ro=1", which means that this volume should be mounted read-only by PVE. this does not work for the rootfs, because LXC expects to touch/create/.. some files on the rootfs on startup. you need to remove the "ro" flag (you can just un-check it on the web interface).
Code:
rootfs: local:102/vm-102-disk-1.raw,ro=1,size=80G
note the "ro=1", which means that this volume should be mounted read-only by PVE. this does not work for the rootfs, because LXC expects to touch/create/.. some files on the rootfs on startup. you need to remove the "ro" flag (you can just un-check it on the web interface).