nv-hostengine drops privileges to --service-account nvidia-dcgm for all
file I/O and writes diagnostics to DCGM_HOME_DIR (/var/log/nvidia-dcgm,
per the packaged unit's Environment=). The package postinst doesn't
reliably create/own this directory inside a live-build chroot, so
dcgmi diag's software deployment check fails with
DCGM_FR_FILE_CREATE_PERMISSIONS at boot even though every GPU passes
the actual hardware tests.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>