udevadm trigger is not permitted while udev is unconfigured

udevadm settle is not permitted while udev is unconfigured
svgalib: cannot open /dev/mem.
gave up waiting for root device. common problems:

_ boot args (cat /prc/cmdline)
- check rootdelay=
- check -root+
-missing modules
ALERT /dev/sdc5 does not exist. dropping to a shell