Depending in what learning stage you are (ArcoLinux learning phases), what iso you are on ArcoLinuxD or Arch Linux or what distribution you are using …

IF you are also using LIGHTDM as your login manager, you may see a “dynamic user” when logging in. See image.

Here is how we can get rid of this dynamic user on the login screen of lightdm.

Go to /etc/lightdm/users.conf and add

/sbin/nologin

to the last line so you get

hidden-shells=/bin/false /urs/bin/nologin /sbin/nologin

Other solutions is to install an extra package

sudo pacman -S accountsservice