On lm-17.x/18.x, inxi has been made less than useful by default, to opt into updating the app via the use of -U, you have to fix inxi,
execute via terminal the line below to fix inxi;
sudo sed --in-place=.bak s/B_ALLOW_UPDATE=false/B_ALLOW_UPDATE=true/ /etc/inxi.conf
the original file /etc/inxi.conf will be saved to /etc/inxi.conf.bak and inxi will update to current version when sudo inxi -U is executed.
inxi on github: https://github.com/smxi/inxi