LVM - cannot create new logical volume

This is on a new laptop that I shrank the windows partition on and used a live CD to create a PV and volume group on. It wouldn't let me create a logical volume, giving me various messages like, the named volume wasn't found, volume group needed cleared, whatever.

Found a page suggesting udev needed reloaded, but I don't want to have to do that 'cause I'm using the gui system-config-lvm and I don't want to have to update the live disc's repositories and re-install that again...

sudo udevadm control --reload-rules

Sorted, straight off.

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